Refactor GRPC integration tests maven version configuration (#3158)

* Use same GRPC version for SCG runtime and proto code generation.
* The protobuf compiler version is set with a version to help bumping.

Author: Abel Salgado Romero

spring-cloud-gateway-integration-tests/grpc/pom.xml

@@ -11,6 +11,7 @@
 	<description>Spring Cloud Gateway gRPC Integration Test</description>
 
 	<properties>
+		<protoc.version>3.25.1</protoc.version>
 		<grpc.version>1.47.1</grpc.version>
 	</properties>
 
@@ -97,7 +98,7 @@
 			<extension>
 				<groupId>kr.motd.maven</groupId>
 				<artifactId>os-maven-plugin</artifactId>
-				<version>1.6.2</version>
+				<version>1.7.1</version>
 			</extension>
 		</extensions>
 		<plugins>
@@ -112,9 +113,9 @@
 				<artifactId>protobuf-maven-plugin</artifactId>
 				<version>0.6.1</version>
 				<configuration>
-					<protocArtifact>com.google.protobuf:protoc:3.19.4:exe:${os.detected.classifier}</protocArtifact>
+					<protocArtifact>com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}</protocArtifact>
 					<pluginId>grpc-java</pluginId>
-					<pluginArtifact>io.grpc:protoc-gen-grpc-java:1.44.0:exe:${os.detected.classifier}</pluginArtifact>
+					<pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
 				</configuration>
 				<executions>
 					<execution>