Bump google-protobuf from 3.21.5 to 3.25.3 in /test/truffle/cexts/grpc

Bumps [google-protobuf](https://github.com/protocolbuffers/protobuf) from 3.21.5 to 3.25.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v3.21.5...v3.25.3)

---
updated-dependencies:
- dependency-name: google-protobuf
  dependency-type: indirect
...

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

test/truffle/cexts/grpc/Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    google-protobuf (3.21.5)
+    google-protobuf (3.25.3)
     googleapis-common-protos-types (1.4.0)
       google-protobuf (~> 3.14)
     grpc (1.48.0)