Bump sphinx from 6.1.3 to 7.1.2

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.1.3 to 7.1.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v6.1.3...v7.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

docs/requirements.txt

@@ -1,2 +1,2 @@
-sphinx			== 6.1.3
+sphinx			== 7.1.2
 sphinx_rtd_theme	== 1.2.2