Retiring python-sphinx-panels in Rawhide+F37

[Elliott Sales de Andrade]

Hi,

python-sphinx-panels is currently FTBFS as it does not support Sphinx
5. It is abandoned upstream with the suggestion of sphinx-design
instead.

My package which depended on it has moved to sphinx-design, and I
believe all others have as well. According to repoquery, there should
be no BuildRequires on it:

$ repoquery --repo=rawhide{,-source} --whatrequires
python3-sphinx-panels --recursive | grep src$ | pkgname | sort | uniq
$ repoquery --repo={fedora,updates}{,-source} --releasever 37
--whatrequires python3-sphinx-panels --recursive | grep src$ | pkgname
| sort | uniq

So I intend to retire it on Rawhide+F37 within the week, unless
someone still needs it.