Updated leakage and pileup correction for Rel 22

Luis Pascual Dominguezrequested to merge
lpascual/athena:LuisIsoLeakage into 22.0

Hello,

This MR updates the leakage and pileup correction files for Release 22. In particular, I have changed the nominal release to be used by default (now REL22) and updated the paths to the files (now placed in the v6 directory).

Tagging @jdevivi to verify that everything looks healthy... Best, Luis

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