Changed Rivet 2.7.2-b to Rivet 3.0.1 in cmake file

Aidan Sean Kellyrequested to merge
akelly/athena:21.6_Rivet_update into 21.6

This merge request is to update the athena version of Rivet to the latest public Rivet release,cc @cgutscho

Edited by Ewelina Maria Lobodzinska

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