Add Ruby 3 to build matrix
This brings back !3702 (merged). We had to revert that MR back then because of an incompatibility with grpc and Ruby 3 that has been resolved for a while now.
Refs #3715 (closed)
Edited by Matthias Käppler
This brings back !3702 (merged). We had to revert that MR back then because of an incompatibility with grpc and Ruby 3 that has been resolved for a while now.
Refs #3715 (closed)