Update libphone number to v8.12.46 am: 16bb0e7854

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libphonenumber/+/17510220

Change-Id: I06278fddd5511df99bfeb00624adf301d980a8ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>