Update `system/libartpalette/OWNERS`. am: 2e8a8ff089 am: 2834ba7efa am: 4470f847d6

Original change: https://android-review.googlesource.com/c/platform/system/libartpalette/+/2845857

Change-Id: I1de012a07d4d06266282e5641f71197f2ae568df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>