issue-652 Protoc fix from Google

Author: nirmalchandra

kafka-testing/pom.xml

@@ -86,6 +86,9 @@
 				<groupId>com.github.os72</groupId>
 				<artifactId>protoc-jar-maven-plugin</artifactId>
 				<version>3.11.4</version>
+				<configuration>
+				    <protocArtifact>com.google.protobuf:protoc:3.21.0-rc-2</protocArtifact>
+				</configuration>
 				<executions>
 					<execution>
 						<phase>generate-sources</phase>