Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.127: - Fixed the setup of the LCG_python3 cache variable for CORAL and COOL; - Moved all cache variable settings into the PreConfig.cmake scripts of all the projects; - Updated flake8 to version 4.0.1; - Added FindVc.cmake to AtlasLCG, and made use of it in AthenaExternals.