Bump pytest-cov from 2.11.0 to 2.11.1 (#563)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.11.0 to 2.11.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst">pytest-cov's changelog</a>.</em></p>
<blockquote>
<h2>2.11.1 (2021-01-20)</h2>
<ul>
<li>Fixed support for newer setuptools (v42+).
Contributed by Michał Górny in <code>[#451](pytest-dev/pytest-cov#451) &lt;https://github.com/pytest-dev/pytest-cov/pull/451&gt;</code>_.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/5e1913e013eb06d5bd1357695349d0a75fbf0503"><code>5e1913e</code></a> Bump version: 2.11.0 → 2.11.1</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/51f1f2b353ef388a00810f28f8682f891d699332"><code>51f1f2b</code></a> Update changelog.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/d39de1eea7a2d8451fa14cd45298caeead3bf2cc"><code>d39de1e</code></a> Fix custom commands with newer setuptools</li>
<li>See full diff in <a href="https://github.com/pytest-dev/pytest-cov/compare/v2.11.0...v2.11.1">compare view</a></li>
</ul>
</details>
<br />


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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`.

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requirements/pytest.txt

@@ -1,2 +1,2 @@
 pytest==6.2.1
-pytest-cov==2.11.0
+pytest-cov==2.11.1