Hi,

while investigating #1030311, I discovered python3-grpc-tools
contains an old copy of the google protobuf library. In
third_party/protobuf.

This library is used to build, and obviously has old bugs like
https://github.com/protocolbuffers/protobuf/issues/3937 - from
2017/2018.

At the very least this should be registered with the code copy
registry and updated. IMO it would be better to use libprotobuf-dev
and libproto-c though.

Chris