Bump urllib3 from 2.0.4 to 2.0.6 in /docs (#432)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.0.4 to 2.0.6.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.0.4...2.0.6)

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

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

docs/requirements.txt

@@ -31,5 +31,5 @@ regex==2023.8.8
 requests==2.31.0
 six==1.16.0
 soupsieve==2.4.1
-urllib3==2.0.4
+urllib3==2.0.6
 watchdog==3.0.0