CI: Adjust a couple of specs to allow Python 3.11 builds on RHEL 9
    
    This allows running CI tests as:
    
        ./mocktest.sh python-isort --define 'python3_pkgversion 3.11'
    
    Which only makes sense in RHEL, and hence is not done here.
    
    The purpose of this change in Fedora is to make the test spec files identical to c9s,
    for easier future synchronization.
    
    Related c9s commit:
    https://gitlab.com/redhat/centos-stream/rpms/pyproject-rpm-macros/-/commit/e8933acb121b684c6972ab0b59ac78da9cf542ed