Update furo requirement from ~=2023.8.19 to ~=2023.9.10

Updates the requirements on [furo](https://github.com/pradyunsg/furo) to permit the latest version.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2023.08.19...2023.09.10)

---
updated-dependencies:
- dependency-name: furo
  dependency-type: direct:production
...

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

docs_requirements.txt

@@ -1,2 +1,2 @@
-furo~=2023.8.19
+furo~=2023.9.10
 sphinx~=7.2.6