Bump pip from 21.1.3 to 21.2.1 (PR #3139)

Bumps [pip](https://github.com/pypa/pip) from 21.1.3 to 21.2.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/pypa/pip/blob/main/NEWS.rst">pip's changelog</a>.</em></p>
<blockquote>
<h1>21.2.1 (2021-07-25)</h1>
<h2>Process</h2>
<ul>
<li>The source distribution re-installation feature removal has been delayed to 21.3.</li>
</ul>
<h1>21.2 (2021-07-24)</h1>
<h2>Process</h2>
<ul>
<li><code>pip freeze</code>, <code>pip list</code>, and <code>pip show</code> no longer normalize underscore
(<code>_</code>) in distribution names to dash (<code>-</code>). This is a side effect of the
migration to <code>importlib.metadata</code>, since the underscore-dash normalization
behavior is non-standard and specific to setuptools. This should not affect
other parts of pip (for example, when feeding the <code>pip freeze</code> result back
into <code>pip install</code>) since pip internally performs standard PEP 503
normalization independently to setuptools.</li>
</ul>
<h2>Deprecations and Removals</h2>
<ul>
<li>Git version parsing is now done with regular expression to prepare for the
pending upstream removal of non-PEP-440 version parsing logic. (<code>[#10117](pypa/pip#10117) &lt;https://github.com/pypa/pip/issues/10117&gt;</code>_)</li>
<li>Re-enable the &quot;Value for ... does not match&quot; location warnings to field a new
round of feedback for the <code>distutils</code>-<code>sysconfig</code> transition. (<code>[#10151](pypa/pip#10151) &lt;https://github.com/pypa/pip/issues/10151&gt;</code>_)</li>
<li>Remove deprecated <code>--find-links</code> option in <code>pip freeze</code> (<code>[#9069](pypa/pip#9069) &lt;https://github.com/pypa/pip/issues/9069&gt;</code>_)</li>
</ul>
<h2>Features</h2>
<ul>
<li>
<p>New resolver: Loosen URL comparison logic when checking for direct URL reference
equivalency. The logic includes the following notable characteristics:</p>
<ul>
<li>The authentication part of the URL is explicitly ignored.</li>
<li>Most of the fragment part, including <code>egg=</code>, is explicitly ignored. Only
<code>subdirectory=</code> and hash values (e.g. <code>sha256=</code>) are kept.</li>
<li>The query part of the URL is parsed to allow ordering differences. (<code>[#10002](pypa/pip#10002) &lt;https://github.com/pypa/pip/issues/10002&gt;</code>_)</li>
</ul>
</li>
<li>
<p>Support TOML v1.0.0 syntax in <code>pyproject.toml</code>. (<code>[#10034](pypa/pip#10034) &lt;https://github.com/pypa/pip/issues/10034&gt;</code>_)</p>
</li>
<li>
<p>Added a warning message for errors caused due to Long Paths being disabled on Windows. (<code>[#10045](pypa/pip#10045) &lt;https://github.com/pypa/pip/issues/10045&gt;</code>_)</p>
</li>
<li>
<p>Change the encoding of log file from default text encoding to UTF-8. (<code>[#10071](pypa/pip#10071) &lt;https://github.com/pypa/pip/issues/10071&gt;</code>_)</p>
</li>
<li>
<p>Log the resolved commit SHA when installing a package from a Git repository. (<code>[#10149](pypa/pip#10149) &lt;https://github.com/pypa/pip/issues/10149&gt;</code>_)</p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pypa/pip/commit/bd41229cdced10d2b7c304a1ef2d61baad3c7da0"><code>bd41229</code></a> Bump for release</li>
<li><a href="https://github.com/pypa/pip/commit/765a4b40227653d22d30c85448ec343e542f41d7"><code>765a4b4</code></a> Bump for development</li>
<li><a href="https://github.com/pypa/pip/commit/3d25c5327d0887271958999ac44709728b5c4f5a"><code>3d25c53</code></a> Bump for release</li>
<li><a href="https://github.com/pypa/pip/commit/27b9a9c35c96e4032af7603ca03651d8f5917681"><code>27b9a9c</code></a> Update AUTHORS.txt</li>
<li><a href="https://github.com/pypa/pip/commit/b9dbab277b7206fd9efc16cef793ab01ccfb32fb"><code>b9dbab2</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pypa/pip/issues/10199">#10199</a> from uranusjr/remove-local-sdist-reinstall</li>
<li><a href="https://github.com/pypa/pip/commit/33b7f0cd9e0fff6bd532941a530d7f8b3472eb55"><code>33b7f0c</code></a> Remove deprecated sdist reinstall feature for 21.2</li>
<li><a href="https://github.com/pypa/pip/commit/a8b8d4d7fe214a0d4e78b0d98d0b97e471858fe5"><code>a8b8d4d</code></a> Document how to install provides_extras from local wheel file (<a href="https://github-redirect.dependabot.com/pypa/pip/issues/9698">#9698</a>)</li>
<li><a href="https://github.com/pypa/pip/commit/239a30737277887fed9f609ae786a0fb80591be4"><code>239a307</code></a> Error handling upon <code>uninstall</code> invalid parameter (<a href="https://github-redirect.dependabot.com/pypa/pip/issues/10171">#10171</a>)</li>
<li><a href="https://github.com/pypa/pip/commit/5e86264b5ac1c62d08f91a16a068647d8872e4e8"><code>5e86264</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pypa/pip/issues/10189">#10189</a> from harupy/type-annotations-index-models</li>
<li><a href="https://github.com/pypa/pip/commit/02b1855b45eb143b524f773eafb46d77406504d3"><code>02b1855</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pypa/pip/issues/10188">#10188</a> from harupy/type-annotations-req</li>
<li>Additional commits viewable in <a href="https://github.com/pypa/pip/compare/21.1.3...21.2.1">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pip&package-manager=pip&previous-version=21.1.3&new-version=21.2.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</details>

changelogs/unreleased/3139-dependabot.yml

@@ -0,0 +1,5 @@
+change-type: patch
+description: Bump pip from 21.1.3 to 21.2.1
+destination-branches:
+- master
+sections: {}

requirements.txt

@@ -12,7 +12,7 @@ jinja2==3.0.1
 more-itertools==8.8.0
 netifaces==0.11.0
 packaging==21.0
-pip==21.1.3
+pip==21.2.1
 ply==3.11
 pydantic==1.8.2
 pyformance==0.4