Updating PRW files for mc23a, d corresponding to latest GRL updates

Chris Malena Delitzschrequested to merge
cdelitzs/athena:main-PRW-files into main

Updating the PRW files for mc23a and mc23d to reflect the recent updates for the 2022 + 2023 GRLs in !79195 (merged)

The differences between the currently implemented mu distribution and the new one are shown in the figures below.

2022_diff

2023_diff

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