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

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

Change-Id: I9e57552b8ff337cb5beefa2b70d655ffbc97fcfd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>