Build(deps): Bump sphinx-notfound-page in /requirements

Bumps [sphinx-notfound-page](https://github.com/readthedocs/sphinx-notfound-page) from 1.0.0 to 1.0.4.
- [Changelog](https://github.com/readthedocs/sphinx-notfound-page/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-notfound-page@1.0.0...1.0.4)

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

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

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -31,7 +31,7 @@ sphinx-autobuild==2024.4.16
 sphinx-autodoc-typehints==2.0.0
 sphinx-copybutton==0.5.2
 sphinx-gallery==0.16.0
-sphinx-notfound-page==1.0.0
+sphinx-notfound-page==1.0.4
 sphinx_design==0.6.0
 sphinxcontrib-websupport==1.2.7
 jupytext==1.16.1