Use longer timeout to run sign_virt_apex in tests am: 9bfb1a1126 am: aff7c494f8 am: 80b6cc6503 am: f70a98e6c2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2067231

Change-Id: I3eca5dd376355254e3df5fe110cbc3d3b2386322
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>