Bump sphinx-notfound-page in the version-updates group

Bumps the version-updates group with 1 update: [sphinx-notfound-page](https://github.com/readthedocs/sphinx-notfound-page).


Updates `sphinx-notfound-page` from 1.0.4 to 1.1.0
- [Changelog](https://github.com/readthedocs/sphinx-notfound-page/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-notfound-page@1.0.4...1.1.0)

---
updated-dependencies:
- dependency-name: sphinx-notfound-page
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: version-updates
...

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

requirements.txt

@@ -12,7 +12,7 @@ sphinx-tabs==3.4.7
 
 # Sphinx not found page extension
 # https://pypi.org/project/sphinx-notfound-page/
-sphinx-notfound-page==1.0.4
+sphinx-notfound-page==1.1.0
 
 # Sphinx opengraph extension
 # https://pypi.org/project/sphinxext-opengraph/