AthenaPoolCnvSvc+RootStorageSvc: Workaround for the ROOT forward compatibility issue
This MR sets the forward compatibility bit for EVNT
and RDO
files to work around the issue discussed in ATEAM-1001. Once the ROOT fix is backported to the version that is used in release 21, we probably won't need this. To be confirmed.
Closes ATEAM-1001