Bump furo from 2024.8.6 to 2025.7.19 in /docs (TGSAI#578)

Bumps [furo](https://github.com/pradyunsg/furo) from 2024.8.6 to 2025.7.19.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2024.08.06...2025.07.19)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.7.19
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,4 +1,4 @@
-furo==2024.8.6
+furo==2025.7.19
 linkify-it-py==2.0.3
 myst-nb==1.2.0
 sphinx==8.2.3