[Operator] Update Maven JIB plugin to 3.3.1

Change-Id: I107b5a5c33675dc7306b0b6b57c0fbefba9a5fd5
diff --git a/operator/pom.xml b/operator/pom.xml
index c9f13c8..649e89b 100644
--- a/operator/pom.xml
+++ b/operator/pom.xml
@@ -122,7 +122,7 @@
 			<plugin>
 				<groupId>com.google.cloud.tools</groupId>
 				<artifactId>jib-maven-plugin</artifactId>
-				<version>3.2.0</version>
+				<version>3.3.1</version>
 				<configuration>
 					<container>
 						<mainClass>com.google.gerrit.k8s.operator.GerritOperator</mainClass>