Bump protobufjs from 7.2.4 to 7.4.0 in /test/functions

Bumps [protobufjs](https://github.com/protobufjs/protobuf.js) from 7.2.4 to 7.4.0.
- [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-v7.2.4...protobufjs-v7.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>