[automerger skipped] Update google-java-format-diff.py to v1.15.0 am: bb513e201d -s ours

am skip reason: Merged-In Iea7f2b845dba8075f3b5e9539d5de6a90ada7103 with SHA-1 6a42b79299 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/tools/+/20679254

Change-Id: Ia66dc496a53461128f924d6393c8bdfc2bd98f43
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>