Update Python rosdep: Install gRPC from PIP instead of APT

[tropappar]

Please update the following dependencies in the rosdep database.

Package name:

• python3-grpcio / grpcio
• python3-grpc-tools / grpcio-tools

Package Upstream Source

• https://github.com/grpc/grpc
• https://github.com/grpc/grpc/tree/master/tools/distrib/python/grpcio_tools

Purpose of using this

The update is needed because the APT version is outdated. See this protobuf issue.

Links to Distribution Packages

• Python
  • https://pypi.org/project/grpcio/
  • https://pypi.org/project/grpcio-tools/

[github-actions]

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For changes related to rosdep:

• ✅ Platforms for new rosdep rules are valid
• ✅ Installers for new rosdep rules are valid

For changes related to yamllint:

• ✅ All new lines of YAML pass linter checks

[tropappar]

The gRPC packages depend on python3-typing-extensions / typing_extensions which are already installed as a dependency by several ROS packages (e.g. launch-ros).

So, one need to run rosdep with the PIP ignore installed option:

 export PIP_IGNORE_INSTALLED=1

[mjcarroll]

Unfortunately, this change goes against our policy. We use the distribution versions (e.g., via apt) whenever possible, as it is impossible to create Debian packages against versions that come from external packaging tools like pip. It is ultimately up to the upstream Debian/Ubuntu maintainers to package recent versions of grpc.

Alternatively, if you require a newer version for a specific non-packaging workflow, we could consider adding an explicit -pip key (e.g. python3-grpcio-pip), but the standard keys must resolve to the system packages.