chore(deps): bump sphinx from 6.2.1 to 8.1.3

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.2.1 to 8.1.3.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.1.3/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v6.2.1...v8.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 8.1.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

poetry.lock

@@ -43,7 +43,7 @@ pytest-httpx = "^0.35.0"
 python-semantic-release = "^7.32.2"
 pytest-cov = "^4.0.0"
 pre-commit = ">=2.20,<4.0"
-sphinx = "^6.0.0"
+sphinx = ">=6,<9"
 sphinx-click = "^4.4.0"
 sphinxnotes-markdown-builder = "^0.5.6"
 poethepoet = ">=0.17.1,<0.37.0"