Merge "Upgrade protobuf-codegen to 3.2.0" am: e4db0b7bb5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf-codegen/+/2519368

Change-Id: If195d53dc02c341879f25eb875c5a09f6a319b54
Signed-off-by: Automerger Merge Worker <[email protected]>