It seems like hasConversion() must be provided by classes using this trait. How about adding it as abstract method to this trait?
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
It seems like $conversionName can also be of type null; however, parameter $conversionName of ByTIC\MediaLibrary\UrlGe...ctory::createForMedia() does only seem to accept string, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation