Merge "Upgrade rust/crates/protobuf-codegen to 2.18.0" am: b3bcffa192 am: 1d6226ac6f

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

Change-Id: I74bdecdcba6ea0829a54f89bba558aa1e7bbf553