Pileup mc23a
Updating the mc23a profile, correcting the bug in the data preparation script that resulted in 9% lower mu in the previous iteration.
The maximum number of pileup events is also updated (61.5 => 67.5) in the Campaigns package. While doing this, I realized that it was set incorrectly (too low) for the mc23c campaign in the legacy file, so that is updated also to match the (correct) CA number.