Bump sphinx from 8.1.3 to 8.2.1 in the sphinx group across 1 directory

Bumps the sphinx group with 1 update in the / directory: [sphinx](https://github.com/sphinx-doc/sphinx).


Updates `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
  dependency-group: sphinx
...

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

requirements.txt

@@ -371,7 +371,7 @@ sortedcontainers==2.4.0
     # via hypothesis
 soupsieve==2.6
     # via beautifulsoup4
-sphinx==8.1.3
+sphinx==8.2.1
     # via
     #   qcodes (pyproject.toml)
     #   autodocsumm