Fix update.sh to remove darwin-arm64 am: 655506b9bd

Original change: https://android-review.googlesource.com/c/platform/prebuilts/jdk/jdk11/+/2072707

Change-Id: Ic9a2e5e685c717214fa5c799b24f0a301fc8d59f
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>