cmd/protoc-gen-go-grpc: enable edition 2023 support

[mkruskal-google]

Fixes #7067

None of the edition 2023 features affect grpc, and go-protobuf already supports editions

RELEASE NOTES: n/a

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.39%. Comparing base (1811c6f) to head (b6e2e52).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7351      +/-   ##
==========================================
- Coverage   81.40%   81.39%   -0.02%     
==========================================
  Files         348      348              
  Lines       26761    26761              
==========================================
- Hits        21786    21783       -3     
- Misses       3782     3786       +4     
+ Partials     1193     1192       -1     

see 17 files with indirect coverage changes

[dfawley]

Thanks for the PR. This LGTM. Note that "RELEASE NOTES" is our auto-generated grpc library release notes, and we release protoc-gen-go-grpc separately, so I removed them from your comment.

[dfawley]

Sorry, one request: could you add the "edition" tag to examples/route_guide/routeguide/route_guide.proto which will confirm this works as intended? You may need to regenerate the protos if you do that by running scripts/regenerate.sh.

Testing

[mkruskal-google]

Sure np, I had to update the protoc version you're testing with too. But as expected, no meaningful differences to gencode