Update python-av to rev 6 via SR 816734
    
    https://build.opensuse.org/request/show/816734
    by user StevenK + dimstar_suse
    - Update to 8.0.2:
      * v8.0.2
        + Minor:
          - Enable GnuTLS support in the FFmpeg build used for binary wheels (:issue:`675`).
          - Make binary wheels compatible with Mac OS X 10.9+ (:issue:`662`).
          - Drop Python 2.x buffer protocol code.
          - Remove references to previous repository location.
      * v8.0.1
        + Minor:
          - Enable additional FFmpeg features in the binary wheels.
          - Use os.fsencode for both input and output file names (:issue:`600`).
      * v8.0.0
        + Major:
          - Drop support for Python 2 and Python 3.4.
          - Provide binary wheels for Linux, Mac and Windows.
        + Minor:
          - Remove shims for obsolete FFmpeg versions (:issue:`588`).
          - Add yuvj420p format for :meth:`VideoFrame.from_ndarray` and :meth:`VideoFrame.to_ndarray` (:issue:`583`).