main purpose of the build: fix bug in skel.ABtoEVNT.py crashing E2E filtering, contains MRs: https://gitlab.cern.ch/atlas/athena/-/merge_requests/60621 PowhegControl update to the test version ATLASOTF-gg4l-TEST https://gitlab.cern.ch/atlas/athena/-/merge_requests/60656 Add VINCIA Userhook to CMakeLists in r21 https://gitlab.cern.ch/atlas/athena/-/merge_requests/60683 Fix for path to libraries in gg4l POWHEG https://gitlab.cern.ch/atlas/athena/-/merge_requests/60895 gg4l CVMFS fix for libraries https://gitlab.cern.ch/atlas/athena/-/merge_requests/61486 EvgenJobTransforms: fix bug in skel.ABtoEVGEN.py, go back to Powheg-05-05