Bump sphinx from 8.1.3 to 8.2.1 (#1891)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 8.1.3 to 8.2.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.2.1/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.1.3...v8.2.1)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements_docs.txt

@@ -3,7 +3,7 @@ pyparsing==3.2.1
 python-dateutil==2.9.0.post0
 packaging==24.2
 requests==2.32.3
-sphinx==8.1.3
+sphinx==8.2.1
 MyST-Parser==4.0.1
 xmlrpc2==0.3.1
 sphinx-argparse-cli==1.19.0