Bump sphinx from 1.5.1 to 8.0.2 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 1.5.1 to 8.0.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.0.2/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v1.5.1...v8.0.2)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -12,7 +12,7 @@ pytz==2024.2
 requests==2.32.3
 six==1.11.0
 snowballstemmer==2.2.0
-Sphinx==1.5.1
+Sphinx==8.0.2
 sphinx-rtd-theme==2.0.0
 sphinxcontrib-phpdomain==0.12.0
 urllib3==2.2.3