Bump furo from 2023.7.26 to 2023.8.19

Bumps [furo](https://github.com/pradyunsg/furo) from 2023.7.26 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@2023.07.26...2023.08.19)

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

Signed-off-by: dependabot[bot] <support@github.com>

setup.cfg

@@ -46,7 +46,7 @@ dev =
     setuptools_scm[toml] == 7.1.0
     tox == 4.8.0
 docs =
-    furo == 2023.7.26
+    furo == 2023.8.19
     pyenchant == 3.2.2
     sphinx == 7.2.2
     sphinx_tabs == 3.4.1