Update PowhegEnvironmentConfig.cmake.in to use ATLASOTF-07-10

Andrii Verbytskyirequested to merge
averbyts-main-patch-86861 into main

Update PowhegEnvironmentConfig.cmake.in to use ATLASOTF-07-10

Should be merged after https://its.cern.ch/jira/browse/ATLINFR-5661 is done

@ewelina

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