chore(deps): Update google-protobuf requirement from ~> 3.21 to >= 3.…

…21, < 5.0

Updates the requirements on [google-protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.21.0...v3.23.4)

---
updated-dependencies:
- dependency-name: google-protobuf
  dependency-type: direct:production
...

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

fluent-plugin-formatter-protobuf.gemspec

@@ -35,6 +35,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-rake', '~> 0.6'
   spec.add_development_dependency 'test-unit', '~> 3.3'
   spec.add_runtime_dependency 'fluentd', ['>= 1.0', '< 2']
-  spec.add_runtime_dependency 'google-protobuf', ['~> 3.21']
+  spec.add_runtime_dependency 'google-protobuf', '>= 3.21', '< 5.0'
   spec.add_runtime_dependency 'oj', '~> 3.13'
 end