Bump urllib3 from 1.26.8 to 1.26.20

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.8 to 1.26.20.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.8...1.26.20)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 1.26.20
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs-requirements.txt

@@ -48,5 +48,5 @@ sphinxcontrib-qthelp==1.0.3
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
-urllib3==1.26.8
+urllib3==1.26.20
     # via requests

test-requirements.txt

@@ -78,5 +78,5 @@ tomli==1.2.2
     # via
     #   coverage
     #   pytest
-urllib3==1.26.8
+urllib3==1.26.20
     # via requests