These changes address the following warning showing up on `go get`
operations:
go: module github.com/golang/protobuf is deprecated: Use the
"google.golang.org/protobuf" module instead.
All changes are made using the recommendations in the per-function
deprecation notices from the docs at
https://pkg.go.dev/github.com/golang/protobuf/ptypes
Filling these out as a part of a sweep to ensure we return decent error
messages from our GRPC services.
For this service I didn't come up with any error condition that
warranted changing the code yet. The get -> notfound case seems to be
the main one and the pass through error object seems AOK here.
