Update to 21.2.3

cstratakrequested to merge
cstratak/centos_rpms_python-pip:rebase into c9s

Various backports from Fedora, including but not limited to:

Fix broken uninstallation by a bogus downstream patch

Adapt wheel installation to be more like %pyproject_install, use %python3

Mark the installed LICENSE.txt as %license instead of duplicating it

CI tests cleanup

Resolves: rhbz#1932713

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