Update sphinx requirement from <9.0.0,>=8.2 to >=8.2,<10.0.0

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/v9.0.4/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.2.0...v9.0.4)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.0.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -69,7 +69,7 @@ dev = [
     "coveralls>=3.3.1,<5.0.0",
     "django-coverage-plugin>=2.0.1,<4.0.0",
     "pylint>=3.0.0,<5.0.0",
-    "sphinx>=8.2,<9.0.0",
+    "sphinx>=8.2,<10.0.0",
     "sphinx-rtd-theme>=3,<4",
     "sphinx-intl>=2.0.1,<4.0.0",
     "sphinx-github-changelog>=1.2.0,<2",