tests: Update gem5 dist URL for weekly tests to v22-0

Change-Id: I6ebcb5739df76bd071a3fe261254edfc72cf6839
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/60552
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed