Update sphinx-rtd-theme requirement from ~=2.0.0 to ~=3.0.0

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]>

pyproject.toml

@@ -62,7 +62,7 @@ docs = [
     'sphinx-autodoc-typehints~=2.2.2',
     'sphinx-copybutton~=0.5.2',
     'sphinx-markdown-tables~=0.0.17',
-    'sphinx-rtd-theme~=2.0.0',
+    'sphinx-rtd-theme~=3.0.0',
     'sphinx~=7.3.7',
 ]
 lint = [