staging/sessionstore: bump memory back to 100Mi in response to errors
Error creating: pods "kask-staging-c796559cd-spd5v" is forbidden: [minimum
memory usage per Container is 100Mi, but request is 50Mi., minimum memory
usage per Pod is 100Mi, but request is 52428800.]
Bug: T229697
Change-Id: If88558949a8cef175d5ad6a0206b6c1139441c9b