Merge pull request #1509 from searxng/dependabot/pip/master/sphinx-notfound-page-0.8.3

Bump sphinx-notfound-page from 0.8 to 0.8.3

requirements-dev.txt

@@ -14,7 +14,7 @@ sphinx-jinja==2.0.2
 sphinx-tabs==3.4.1
 sphinxcontrib-programoutput==0.17
 sphinx-autobuild==2021.3.14
-sphinx-notfound-page==0.8
+sphinx-notfound-page==0.8.3
 myst-parser==0.18.0
 linuxdoc==20211220
 aiounittest==1.4.2