Upgrade robolectric to /external/robolectric to prep for removal of /external/robolectric shadows. am: dd7850adc5

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

Change-Id: I0b1c92a3ed4612aa1b1f6706ed26fc18f372c504
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>