Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.122: - Updated prmon to version v3.0.0; - Updated ONNXRuntime to version 1.9.1; - Updated CheckerGccPlugin to handle std::shared_mutex, and to work correctly with ubsan in GCC 11; - Added cppcheck as an external to AthenaExternals; - Multiple updates to AtlasCMake, aiming to make CI tests easier to set up for the atlas/athena repository; - Updated atlas_flake8 to print messages that NICOS would pick up on, in case flake8 is not available; - Updated the GeoModel build to use ZLIB from the LCG release, if an LCG release is used; - Suppressed warnings in the AnalysisBaseExternals and AthAnalysisExternals builds, which were picked up in NICOS since a little while; - Stopped the Acts build from cloning the submodules of the Acts repository.