Tag to be used with the main branch of atlas/athena. Update(s) since 2.1.42: * Update tests to LCG_107a_ATLAS_1 and update ACTS and GeoModel * Fix clang19 compilation of fastjet * FIX CI: Use CERN Harbor registry cache for Ubuntu container * Gdb: use gdb from LCG release * APTypes: add Xilinx arbitrary precision types * AtlasCMake/LCG: remove the use of lsb_release * Update hdf5 to 1.14.6 * Update ACTS, GeoModel and VecMem to latest versions used in Athena main branch