build(deps): bump urllib3 from 1.26.7 to 1.26.17 in /docs

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.7 to 1.26.17.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.7...1.26.17)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

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

docs/requirements.txt

@@ -67,6 +67,6 @@ tqdm==4.62.3
 twine==3.7.1
 typed-ast==1.5.1
 typing-extensions==4.0.1
-urllib3==1.26.7
+urllib3==1.26.17
 webencodings==0.5.1
 zipp==3.6.0