Bump furo from 2025.7.19 to 2025.9.25

Bumps [furo](https://github.com/pradyunsg/furo) from 2025.7.19 to 2025.9.25.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2025.07.19...2025.09.25)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.9.25
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/docs.txt

@@ -3,4 +3,4 @@ sphinx_rtd_theme>=2,<4
 readthedocs-sphinx-search~=0.3
 sphinxcontrib-shellcheck>=1,<2
 sphinx-autobuild>=2020.9.1
-furo==2025.7.19
+furo==2025.9.25