Merge "Upgrade protobuf to 3.2.0" am: 7dc275cd70 am: 9b9bcfecdd am: 7341fcb745 am: 45f0bf3bf0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf/+/2520001

Change-Id: I9442b832e4d9f6a31fbe30994eb97c3465b5aee6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>