Bump urllib3 from 1.26.2 to 1.26.4 (#82)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.2 to 1.26.4.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.4/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.2...1.26.4)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -5,4 +5,4 @@
 #    pip-compile requirements.in
 #
 requests==2.25.0          # via -r requirements.in
-urllib3==1.26.2           # via -r requirements.in, requests
+urllib3==1.26.4           # via -r requirements.in, requests