Bump urllib3 from 1.26.5 to 1.26.6 (#62)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 to 1.26.6.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.6/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.5...1.26.6)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

requirements-dev.txt

@@ -24,6 +24,6 @@ SecretStorage==3.3.1
 six==1.16.0
 tqdm==4.61.1
 twine==3.4.1
-urllib3==1.26.5
+urllib3==1.26.6
 webencodings==0.5.1
 zipp==3.4.1