Pin version of protoc to 3.19.x.

[robshakir]

 * (M) .github/workflows/*.yml
   - update go commands to use latest syntax.
 * (M) scripts/check_updated.sh
  - support protoc-gen-go having started to add versions to output.
 * (M) v1/proto/*
   - update generated protobufs, no semantic changes.

Fixes an issue where the protobuf workflow is failing after protoc-gen-go started adding versions to the generated files.

[nandanarista]

LGTM