Update the license tag to SPDX
    
    See https://gitlab.com/fedora/legal/fedora-license-data/-/merge_requests/61
    
    The LICENSE file differs from the text at https://spdx.org/licenses/Python-2.0.1.html
    only by:
    
     - not saying "Python 2.0.1" but "Python" which is considered OK
     - copyright years which is considered OK
     - formatting
     - listing the history and license for code examples from the documentation
       (the documentation is not shipped via this package)