Bump sphinx from 4.3.0 to 4.3.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 4.3.0 to 4.3.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/4.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v4.3.0...v4.3.1)

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

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

Author: dependabot[bot]

setup.py

@@ -42,7 +42,7 @@
 extras_require = {
     "voice": ["PyNaCl>=1.3.0,<1.5"],
     "docs": [
-        "sphinx==4.3.0",
+        "sphinx==4.3.1",
         "sphinxcontrib_trio==1.1.2",
         "sphinxcontrib-websupport",
     ],