Update sphinx-rtd-theme requirement from ~2.0 to ~3.0 (#183)

Updates the requirements on [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) to permit the latest version.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@2.0.0...3.0.2)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -38,7 +38,7 @@ pytest-cov = "~6.0"
 pytest-unordered = "~0.6"
 pre-commit = "~3.5"
 Sphinx = "~7.1"
-sphinx-rtd-theme = "~2.0"
+sphinx-rtd-theme = "~3.0"
 sphinxcontrib-napoleon = "~0.7"
 m2r = "~0.3"
 third-party-license-file-generator = "~2024.8"