Http4sGrpcModule

Default version of the nscn.polaris2::mill-http4s-grpc-core runtime (this project's core module).

Read from a source file generated out of Versions.publish in build.mill, so it cannot drift from what core actually publishes. A hand-copied constant here would fail late and remotely: the plugin emits the coordinate into a consumer's mvnDeps, so a stale value surfaces as their dependency resolution failing.