build(deps): bump sphinx from 7.0.1 to 7.1.2 in /docs

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.0.1 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@v7.0.1...v7.1.2)

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

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

docs/requirements.txt

@@ -1,6 +1,6 @@
 furo==2023.5.20
 pygments==2.14.0
-sphinx==7.0.1
+sphinx==7.1.2
 sphinx-copybutton==0.5.1
 sphinx-inline-tabs==2022.1.2b11
 sphinxcontrib-towncrier==0.3.2a0