Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.67: - Updated Acts to version v0.22.1; - Updated GeoModelIO to version 3.1.3; - Taught AtlasCMake how to deal with .cu source files when CUDA is not available for the build; - Introduced the triSYCL external, to provide SYCL for builds done without a "SYCL capable" compiler.