Update sphinx-rtd-theme requirement from ~=2.0 to ~=3.0

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...3.0.0)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -4,4 +4,4 @@
 
 pre-commit~=3.6
 sphinx~=7.2
-sphinx-rtd-theme~=2.0
+sphinx-rtd-theme~=3.0