Bump sphinx-rtd-theme from 1.2.0 to 3.0.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.2.0 to 3.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.2.0...3.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

setup.py

@@ -61,7 +61,7 @@
         "docs": [
             "sphinx==5.3.0",
             "sphinx-argparse==0.4.0",
-            "sphinx_rtd_theme==1.2.0",
+            "sphinx_rtd_theme==3.0.0",
             "sphinx-autodoc-typehints==1.23.0",
             "m2r2==0.3.2",
         ],