Chore(deps): Bump sphinx from 8.1.3 to 8.2.1 (#885)

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](https://github.com/sphinx-doc/sphinx/compare/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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -30,9 +30,11 @@ pygments==2.19.1
     # via sphinx
 requests==2.32.2
     # via sphinx
+roman-numerals-py==3.1.0
+    # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==8.1.3
+sphinx==8.2.1
     # via
     #   -r docs/requirements.in
     #   sphinx-rtd-theme