Bump sphinx from 7.4.7 to 9.1.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.7 to 9.1.0.
- [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...v9.1.0)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements_dev.txt

@@ -12,7 +12,7 @@ pytest-mock==3.15.1
 recommonmark==0.7.1
 requests==2.32.5
 requests-mock==1.12.1
-sphinx==7.4.7
+sphinx==8.1.3
 sphinx-rtd-theme==3.0.2
 tqdm==4.67.1
 websocket-client==1.9.0