Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.105: - Updated triSYCL to a version that works correctly with GCC 10; - Added the PyModules and flake8_atlas packages to AthAnalysisExternals; - Updated the dictionary building code to work without warnings with Ninja in CMake 3.20+; - Updated Acts to version v8.1.0.