Bump sphinx-rtd-theme from 1.2.2 to 1.3.0

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.2.2 to 1.3.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.2.2...1.3.0)

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

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

pyproject.toml

@@ -31,7 +31,7 @@ test = [
 ]
 docs = [
     "sphinx >= 1.4",
-    "sphinx_rtd_theme==1.2.2",
+    "sphinx_rtd_theme==1.3.0",
 ]
 
 [tool.black]