Update PowhegEnvironmentConfig.cmake.in to update version to 07-07

Andrii Verbytskyirequested to merge
averbyts-main-patch-96891 into main

Update PowhegEnvironmentConfig.cmake.in to update version to 07-07

Should be merged after !75798 (merged) and after https://its.cern.ch/jira/browse/ATLINFR-5590 is solved

@asaibel @ewelina

Edited by Andrii Verbytskyi

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