Bump Acts v3.0.0 -> v5.0.0; include Fatras in build

Vincent Pascuzzirequested to merge
vpascuzz/atlasexternals:update-Acts into master
  • New version includes (among other things) fix to propagator that is causing crashes in simulation
  • Fatras component needed for simulation

FYI @jchapman, @mduehrss, @yfhan.

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