build(deps): bump packaging from 20.9 to 23.1 in /docs (#2498)

Bumps [packaging](https://github.com/pypa/packaging) from 20.9 to 23.1.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](pypa/packaging@20.9...23.1)

---
updated-dependencies:
- dependency-name: packaging
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

docs/requirements.txt

@@ -8,7 +8,7 @@ idna==3.4
 imagesize==1.2.0
 Jinja2==2.11.3
 MarkupSafe==1.1.1
-packaging==20.9
+packaging==23.1
 Pygments==2.15.0
 pyparsing==2.4.7
 pytz==2021.1