This reverts commit 1c26a4abb0, reversing
changes made to 186824a568.
The changes broke plugin loading when using subcommands so these
changes will be reverted until the underlying issue can be
investigated and resolved.
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
