[releng] Issue #7500: update pixman for F-28 AtomicHost 2-weeks releases

[Dusty Mabe]

dustymabe added a new comment to an issue you are following:
``
@mohanboddu - this would be the first use of the minimal compose if we could get that set up for f28. 
``

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https://pagure.io/releng/issue/7500