Upgrade robolectric to /external/robolectric to prep for removal of /external/robolectric shadows. am: dd7850adc5 am: 1645958ec9 am: 47ea97536f am: c57c5f85a3 am: 6e8716797f am: 7dd0902cf9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/car/setupwizard/+/21754519

Change-Id: Ic4bc560ead957c5a6e82344dd7c800914b4cca8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>