Bump sphinx from 5.3.0 to 8.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 5.3.0 to 8.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v5.3.0...v8.1.3)

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

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

setup.py

@@ -59,7 +59,7 @@
     ],
     extras_require={
         "docs": [
-            "sphinx==5.3.0",
+            "sphinx==8.1.3",
             "sphinx-argparse==0.4.0",
             "sphinx_rtd_theme==1.2.0",
             "sphinx-autodoc-typehints==1.23.0",