Increase rolling subproces output rollout ratio to 60% am: 7b63baa502 am: ef8cbb7b0f

Original change: https://android-review.googlesource.com/c/platform/tools/asuite/+/3379273

Change-Id: I1b9da3ba3154380df4a62a3413b28faf5ec37319
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>