main purpose: validation of MG 3.4.2 contains MRs: https://gitlab.cern.ch/atlas/athena/-/merge_requests/61168 McEventSelector: Use unsigned for RunNumber, etc properties https://gitlab.cern.ch/atlas/athena/-/merge_requests/61161 Add m_useChargedNonShowering https://gitlab.cern.ch/atlas/athena/-/merge_requests/61256 Use access by reference in the loops in HepMC codes https://gitlab.cern.ch/atlas/athena/-/merge_requests/61254 Cleanup the tauola code https://gitlab.cern.ch/atlas/athena/-/merge_requests/61233 Add an exponential filter to obtain a flat decay time sample https://gitlab.cern.ch/atlas/athena/-/merge_requests/61398 23.0-coverity-TruthRivetTools https://gitlab.cern.ch/atlas/athena/-/merge_requests/61442 Update instructions for exotic Pythia8 external versions (only for developers) https://gitlab.cern.ch/atlas/athena/-/merge_requests/61530 switch to LCG_102b_ATLAS_13