Update BlackList_caches.txt
Fixing releases in blacklist since
asetup 21.6.01,AthGeneration
AtlasSetup(FATAL): Fatal exception: !!!ERROR!!! Stable release path=/cvmfs/atlas.cern.ch/repo/sw/software/21.6/AthGeneration/21.6.01 not exist
Please be advised that registry.cern.ch and registry-tn.cern.ch registries (Registry Service) will be unavailable next Tuesday, Feb 11th starting at 08:00h (Geneva time) for a short period of time. This may cause temporary disruptions to your workflows. Further info: OTG0154380
Fixing releases in blacklist since
asetup 21.6.01,AthGeneration
AtlasSetup(FATAL): Fatal exception: !!!ERROR!!! Stable release path=/cvmfs/atlas.cern.ch/repo/sw/software/21.6/AthGeneration/21.6.01 not exist