Bump furo from 2022.6.21 to 2022.9.15 (#1812)

Bumps [furo](https://github.com/pradyunsg/furo) from 2022.6.21 to 2022.9.15.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](https://github.com/pradyunsg/furo/compare/2022.06.21...2022.09.15)

---
updated-dependencies:
- dependency-name: furo
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

setup.py

@@ -65,7 +65,7 @@ setup(
     setup_requires=["pytest-runner"],
     extras_require={
         "docs": [
-            "furo==2022.6.21",
+            "furo==2022.9.15",
             "sphinx-autobuild",
             "codespell",
             "blacken-docs",