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Tag to be used with the 21.X branches of atlas/athena.
Update(s) in this tag:
  - Made FindUUID.cmake set up the correct LCG RPM dependency;
  - Taught yampl how to pick up uuid from the LCG release for its build;
  - Fixed the build of HDF5 with Xcode 12.0;
  - Fixed the build of ROOT 6.20/06 on macOS against our privately built Python version;
  - Fixed the "platform detection" on macOS using modern CMake versions;
  - Eliminated a source of warnings while building AnalysisBaseExternals and AthAnalysisExternals with CMake 3.15+.