Bump sphinx-autobuild from 2021.3.14 to 2025.8.25 (#319)

Bumps [sphinx-autobuild](https://github.com/sphinx-doc/sphinx-autobuild) from 2021.3.14 to 2025.8.25.
- [Release notes](https://github.com/sphinx-doc/sphinx-autobuild/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx-autobuild/blob/main/NEWS.rst)
- [Commits](sphinx-doc/sphinx-autobuild@2021.03.14...2025.08.25)

---
updated-dependencies:
- dependency-name: sphinx-autobuild
  dependency-version: 2025.8.25
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements.txt

@@ -9,5 +9,5 @@ invoke==2.2.1
 pytest==8.4.2
 requests==2.32.5
 sphinx==6.2.1
-sphinx-autobuild==2021.3.14
+sphinx-autobuild==2025.8.25
 sphinx_rtd_theme==3.0.2