Merge "Upgrade rust/crates/protobuf-codegen to 2.18.0" am: b3bcffa192

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf-codegen/+/1451283

Change-Id: I11e768e22df8ef031e04ad95dbcbe5a751c93734