build(deps): bump urllib3 in /docs in the production-dependencies group (#4225)

Bumps the production-dependencies group in /docs with 1 update: [urllib3](https://github.com/urllib3/urllib3).


Updates `urllib3` from 2.5.0 to 2.6.1
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.5.0...2.6.1)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -24,4 +24,4 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
 sphinxext-rediraffe==0.3.0
-urllib3==2.5.0
+urllib3==2.6.1