Update PowhegEnvironmentConfig.cmake.in to bump POWHEG version to 08-04

Andrii Verbytskyirequested to merge
averbyts-main-patch-85152 into main

Update PowhegEnvironmentConfig.cmake.in to bump POWHEG version to 08-04

Should be merged once https://its.cern.ch/jira/browse/ATLINFR-5699 is done.

@tpelzer @ewelina

Edited by Andrii Verbytskyi

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