Bump furo from 2023.5.20 to 2023.8.19

Bumps [furo](https://github.com/pradyunsg/furo) from 2023.5.20 to 2023.8.19.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2023.05.20...2023.08.19)

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

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

pyproject.toml

@@ -45,7 +45,7 @@ dev = [
     "setuptools",
     "wheel",
     "Sphinx>=6.0,<8.0",
-    "furo==2023.5.20",
+    "furo==2023.8.19",
     "myst-parser>=1.0,<2.1",
     "sphinx-copybutton==0.5.2",
     "sphinx-autobuild==2021.3.14",