Bump sphinx from 7.4.7 to 8.0.2 (pyca#11369)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.7 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.4.7...v8.0.2)

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

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

Author: dependabot[bot]

ci-constraints-requirements.txt

@@ -109,7 +109,7 @@ ruff==0.6.3
     # via cryptography (pyproject.toml)
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==7.4.7
+sphinx==8.0.2
     # via
     #   cryptography (pyproject.toml)
     #   sphinx-rtd-theme