Upgrade robolectric to /external/robolectric to prep for removal of /external/robolectric shadows. am: 600b578e12 am: 01af2f37f4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/EmergencyInfo/+/21778422

Change-Id: I35240e75019caa00b995f7c5dc1890877a611a9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>