build(deps): bump furo from 2024.8.6 to 2025.12.19 in /examples (#237)

Bumps [furo](https://github.com/pradyunsg/furo) from 2024.8.6 to 2025.12.19.
- [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...2025.12.19)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.12.19
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

examples/sphinx/requirements.txt

@@ -1,3 +1,3 @@
-furo==2024.8.6
+furo==2025.12.19
 rstcheck[sphinx]==6.2.5
 Sphinx==8.2.3