Update google-protobuf requirement from ~> 3.25 to >= 3.25, < 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](https://github.com/protocolbuffers/protobuf/commits)

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

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

pbbuilder.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.files = `git ls-files`.split("\n")
   spec.test_files = `git ls-files -- test/*`.split("\n")
 
-  spec.add_dependency "google-protobuf", "~> 3.25"
+  spec.add_dependency "google-protobuf", ">= 3.25", "< 5.0"
   spec.add_dependency "activesupport"
   spec.add_development_dependency 'm'
   spec.add_development_dependency "pry"