Bump urllib3 from 1.26.15 to 1.26.17 in /docs

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.15 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@1.26.15...1.26.17)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -8,5 +8,5 @@ sphinx-autopackagesummary==1.3
 autodocsumm==0.2.2
 pathlib==1.0.1
 jinja2==3.0.3
-urllib3==1.26.15 # New urllib version breaks sphinx
+urllib3==1.26.17 # New urllib version breaks sphinx
 -r ./requirements_mkdoc.txt