Update from github.com/golang/protobuf to google.golang.org/protobuf #382
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The old module, github.com/golang/protobuf, has been deprecated a while, and the newer API has a slightly improved interface for the timestamp type as well, avoiding a potential error that needs to be handled (that we've traditionally ignored anyway in our own code).
Note there is a remaining caller of the old module in Google's appengine module, which gets vendored in unnecessarily via x/oauth2 (golang/oauth2#615).
In passing, update the protoc-gen-go tool as well to the version hosted in the new repository.
Depends on pganalyze/collector-snapshot#30 for the "go_package" option which is now required by protoc-gen-go.