build(deps): bump urllib3 from 1.26.16 to 2.5.0 in /docs

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.16 to 2.5.0.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.16...2.5.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.5.0
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -117,5 +117,5 @@ tornado==6.4.2
     # via livereload
 treelib==1.6.4
     # via -r ../tools/lib-alert-tree/requirements.txt
-urllib3==1.26.16
+urllib3==2.5.0
     # via requests