Bump sphinx from 7.4.4 to 8.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 7.4.4 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@v7.4.4...v8.1.3)

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

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

pyproject.toml

@@ -36,7 +36,7 @@ dev = [
     "pytest-cov",
     "pytest-mock",
     "ruff",
-    "Sphinx==7.4.4",
+    "Sphinx==8.1.3",
     "sphinx-autobuild",
     "sphinx-copybutton",
     "sphinx-design",