LArG4FCAL+LArG4FastSimSvc: cmake cleanup, enable flake8
Remove unused external dependencies, update link dependencies and enable flake8.
GitLab Registry scheduled maintenance on Wednesday, October 09th 2024 as of 20:00h Geneva time for a period of 1 hour. Further information under https://cern.ch/otg0152540.
Remove unused external dependencies, update link dependencies and enable flake8.