Upgrade robolectric to /external/robolectric to prep for removal of /external/robolectric shadows. am: 1566c28a4b am: fb3b204deb am: 6c28b46f53

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Car/Cluster/+/21738368

Change-Id: I3bf3d51378ec2d1f0ccb50cac3a78de8a0251a4c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 21acad954e1523f152a355d5f6a7650fb119341e
  1. ClusterHomeSample/
  2. ClusterOsDouble/
  3. DirectRenderingCluster/