Update sphinx requirement from <8,>=5.3 to >=5.3,<9 in /bindings/python

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [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@v5.3.0...v8.1.3)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
...

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

Author: dependabot[bot]

bindings/python/docs/docs-requirements.txt

@@ -1,4 +1,4 @@
-sphinx>=5.3,<8
+sphinx>=5.3,<9
 sphinx_rtd_theme>=2,<3
 sphinxcontrib-shellcheck>=1,<2
 furo==2023.9.10