Bump protoc_plugin from 21.1.2 to 22.0.1 and protobuf to 4.0.0 (#2554)

* Bump protoc_plugin from 21.1.2 to 22.0.0 (note, we did 22.0.1 instead)

Bumps [protoc_plugin](https://github.com/google/protobuf.dart) from 21.1.2 to 22.0.0.
- [Release notes](https://github.com/google/protobuf.dart/releases)
- [Commits](google/protobuf.dart@protoc_plugin-v21.1.2...protoc_plugin-v22.0.0)

---
updated-dependencies:
- dependency-name: protoc_plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* update protoc_plugin to 22.0.1 and protobuf to 4.0.0

---------

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

Author: dependabot[bot]

pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   package_config: ^2.0.0
   path: ^1.8.0
   pool: ^1.5.1
-  protobuf: ">=2.0.0 <4.0.0"
+  protobuf: "^4.0.0"
   pub_semver: ^2.0.0
   source_maps: ^0.10.10
   source_span: ^1.10.0
@@ -45,7 +45,7 @@ dev_dependencies:
   grinder: ^0.9.0
   node_preamble: ^2.0.2
   lints: ">=4.0.0 <6.0.0"
-  protoc_plugin: ^21.1.2
+  protoc_plugin: "^22.0.1"
   pub_api_client: ">=2.1.1 <4.0.0"
   pubspec_parse: ^1.3.0
   test: ^1.16.7