Bump the pip group with 6 updates

Updates the requirements on [furo](https://github.com/pradyunsg/furo), [sphinx-autobuild](https://github.com/sphinx-doc/sphinx-autobuild), [sphinx-inline-tabs](https://github.com/pradyunsg/sphinx-inline-tabs), [sphinx-notfound-page](https://github.com/readthedocs/sphinx-notfound-page), [sphinx-copybutton](https://github.com/executablebooks/sphinx-copybutton) and [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.

Updates `furo` 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@2022.06.04...2025.12.19)

Updates `sphinx-autobuild` 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@2024.09.19...2025.08.25)

Updates `sphinx-inline-tabs` to 2025.12.21.14
- [Commits](pradyunsg/sphinx-inline-tabs@2023.04.21...2025.12.21.14)

Updates `sphinx-notfound-page` to 1.1.0
- [Changelog](https://github.com/readthedocs/sphinx-notfound-page/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-notfound-page@1.0.0...1.1.0)

Updates `sphinx-copybutton` to 0.5.2
- [Release notes](https://github.com/executablebooks/sphinx-copybutton/releases)
- [Changelog](https://github.com/executablebooks/sphinx-copybutton/blob/master/CHANGELOG.md)
- [Commits](executablebooks/sphinx-copybutton@v0.3.3...v0.5.2)

Updates `sphinx` to 9.1.0
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.2.3...v9.1.0)

---
updated-dependencies:
- dependency-name: furo
  dependency-version: 2025.12.19
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: sphinx-autobuild
  dependency-version: 2025.8.25
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: sphinx-inline-tabs
  dependency-version: 2025.12.21.14
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: sphinx-notfound-page
  dependency-version: 1.1.0
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: sphinx-copybutton
  dependency-version: 0.5.2
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: sphinx
  dependency-version: 9.1.0
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,11 +1,11 @@
-furo>=2022.6.4
+furo>=2025.12.19
 jinja2
 linklint
-sphinx-autobuild>=2024.9.19
-sphinx-inline-tabs>=2023.4.21
+sphinx-autobuild>=2025.8.25
+sphinx-inline-tabs>=2025.12.21.14
 sphinx-lint==1.0.2
-sphinx-notfound-page>=1.0.0
-sphinx_copybutton>=0.3.3
+sphinx-notfound-page>=1.1.0
+sphinx_copybutton>=0.5.2
 sphinxext-opengraph>=0.13.0
 sphinxext-rediraffe
-Sphinx>=8.2.3
+Sphinx>=9.1.0