Update product-composer to version 0.6.2 / rev 38 via SR 1282796
    
    https://build.opensuse.org/request/show/1282796
    by user adrianSuSE + dimstar_suse
    - update to version 0.6.2
      * crash fix for agama builds
      * Rework package set calculation
    
        The new code allows to reference package sets that are defined
        later in the recipe. It also allows to specify a flavor or
        architecture in the reference, so that a flavor can reuse the
        package set of a different flavor.
    
    - update to version 0.6.1:
      * fixing a crash when no 'iso' tag is defined