Bump sphinx from 5.1.1 to 5.2.3 (#717)

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.1.1 to 5.2.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/5.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v5.1.1...v5.2.3)

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

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

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

setup.py

@@ -68,7 +68,7 @@
             "freezegun>=1.1.0",
             "mypy>=v0.910",
             # Docs.
-            "Sphinx==5.1.1 ; python_version>='3.6'",
+            "Sphinx==5.2.3 ; python_version>='3.6'",
             "sphinx-autobuild==2021.3.14 ; python_version>='3.6'",
             "sphinx-rtd-theme==1.0.0 ; python_version>='3.6'",
             "docutils==0.16 ; python_version>='3.6'",