csdiff.spec: boost-python3-devel was merged into boost-devel in Fedora 33
    
    ... and the corresponding obsoletes tag was removed in Fedora 37.
    
    Upstream-commit: b7540e9f3ab6ab4d54615ad8737ee84ebca5a689
    Signed-off-by: Kamil Dudka <kdudka@redhat.com>
    Closes: https://src.fedoraproject.org/rpms/csdiff/pull-request/2
    Related: #2100748 - boost-devel no longer provides boost-python3-devel