Bump protobuf from 3.1.0 to 5.0.0 in the pub group

Bumps the pub group with 1 update: [protobuf](https://github.com/google/protobuf.dart).


Updates `protobuf` from 3.1.0 to 5.0.0
- [Release notes](https://github.com/google/protobuf.dart/releases)
- [Commits](google/protobuf.dart@protobuf-v3.1.0...protobuf-v5.0.0)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: pub
...

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

Author: dependabot[bot]

pubspec.yaml

@@ -14,7 +14,7 @@ dependencies:
   args: ^2.4.0
   package_config: ^2.1.0
   path: ^1.8.3
-  protobuf: ^3.1.0
+  protobuf: ^6.0.0
   pubspec_parse: ^1.2.1
   pubspec_lock_parse: ^2.2.0
   collection: ^1.18.0