python-h2 fails to build with Sphinx 4.0.2 in Fedora 35 (currently Rawhide).

+ sphinx-build-3 docs/source html
Running Sphinx v4.0.2
making output directory... done
...
WARNING: autodoc: failed to import class 'connection.H2Connection' from module 'h2'; the following exception was raised:
No module named 'h2'
WARNING: autodoc: failed to import class 'config.H2Configuration' from module 'h2'; the following exception was raised:
No module named 'h2'
WARNING: autodoc: failed to import class 'events.RequestReceived' from module 'h2'; the following exception was raised:
No module named 'h2'
...
done
checking consistency... done
preparing documents... done
writing output... [  5%] advanced-usage
writing output... [ 10%] api
...
dumping object inventory... done
build succeeded, 41 warnings.
The HTML pages are in html.
+ rm -rf html/.doctrees html/.buildinfo
+ rm -v html/_static/underscore.js
removed 'html/_static/underscore.js'
+ ln -s /usr/share/javascript/underscore/underscore-min.js html/_static/underscore.js
+ rm -v html/_static/underscore-1.12.0.js
rm: cannot remove 'html/_static/underscore-1.12.0.js': No such file or directory
error: Bad exit status from /var/tmp/rpm-tmp.TUhnKD (%build)
    Bad exit status from /var/tmp/rpm-tmp.TUhnKD (%build)
RPM build errors:
Child return code was: 1

For the logs from testing build attempts, see:
https://copr.fedorainfracloud.org/coprs/ksurma/pygments-2.9.0/package/python-h2/

You can test you package using Koji scratch build
koji build --scratch <srpm>

For details regarding the Sphinx change, see https://fedoraproject.org/wiki/Changes/Sphinx4
Let us know here if you have any questions. Thank you!