contains MRs: https://gitlab.cern.ch/atlas/athena/-/merge_requests/41972 update atlasexternal version to 1.0.73 and Pythia8 to 8.245p3 https://gitlab.cern.ch/atlas/athena/-/merge_requests/42044 ParticleGun deep copy for histogram sampling https://gitlab.cern.ch/atlas/athena/-/merge_requests/42053 convince MG to use the correct lhapdf-config https://gitlab.cern.ch/atlas/athena/-/merge_requests/42116 Update README.md for Rivet https://gitlab.cern.ch/atlas/athena/-/merge_requests/42143 allow reseeding for Epos jobs