requested to merge jchapman/athena:OldStyleFrozenShowersUpdate_master into master
[POSTPONED] GitLab sender email address for notifications won't be changing effective Monday, March 4th at 17:30h. (ffi: OTG0148869)
Update library version used in old-style configuration of Frozen Showers to match CA-based configuration.
Follows on from !51569 (merged) where the CA-based configuration was updated to use the new MC21_v1 version of the Frozen Shower libraries, but the old-style configuration was not.
Should fix ATLASSIM-5781