tests: Update nightly test docker image tags to v22-1

Change-Id: I3d1fa67a89594050cb8069541004763ac5ba66a4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65920
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed