Update protobuf packages to v4 (major) (#395)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

grpc/build.gradle.kts

@@ -16,15 +16,15 @@ java {
 }
 
 var grpcVersion = "1.65.1" // CURRENT_GRPC_VERSION
-var protobufVersion = "3.25.4"
+var protobufVersion = "4.27.3"
 var protocVersion = protobufVersion
 
 dependencies {
     runtimeOnly ("io.grpc:grpc-netty-shaded:${grpcVersion}")
     implementation ("io.grpc:grpc-protobuf:${grpcVersion}")
     implementation ("io.grpc:grpc-services:${grpcVersion}")
     implementation ("io.grpc:grpc-stub:${grpcVersion}")
-    implementation ("com.google.protobuf:protobuf-java-util:3.25.4")
+    implementation ("com.google.protobuf:protobuf-java-util:4.27.3")
     implementation ("io.opentelemetry.instrumentation:opentelemetry-grpc-1.6:1.32.0-alpha")
     implementation ("com.google.guava:guava:33.2.1-jre")