Update aml to version 0.3.0 / rev 6 via SR 1060476
    
    https://build.opensuse.org/request/show/1060476
    by user jubalh + dimstar_suse
    - Update to 0.3.0:
      * The time unit has been changed from milliseconds to microseconds
      * The global object registry has been replaced with weak references
      * It is now guaranteed that a callback will not be called after aml_stop().
      * Worker threads now keep references to work objects that are being
        executed. This ensures that they cannot be freed while they
        are being worked