Bump jib-maven-plugin from 3.3.0 to 3.3.1 (#394)

pom.xml

@@ -258,7 +258,7 @@
         <plugin>
           <groupId>com.google.cloud.tools</groupId>
           <artifactId>jib-maven-plugin</artifactId>
-          <version>3.3.0</version>
+          <version>3.3.1</version>
           <configuration>
             <skip>true</skip>
           </configuration>