chore(deps): bump protobufjs from 7.1.2 to 7.2.4 in /sample/004-grpc-…

…app (#2299)

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) from 7.1.2 to 7.2.4.
- [Release notes](https://github.com/protobufjs/protobuf.js/releases)
- [Changelog](https://github.com/protobufjs/protobuf.js/blob/master/CHANGELOG.md)
- [Commits](protobufjs/protobuf.js@protobufjs-v7.1.2...protobufjs-v7.2.4)

---
updated-dependencies:
- dependency-name: protobufjs
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>