Bump com.google.cloud.tools:jib-maven-plugin from 3.4.2 to 3.4.3 (#906)

pom.xml

@@ -300,7 +300,7 @@
         <plugin>
           <groupId>com.google.cloud.tools</groupId>
           <artifactId>jib-maven-plugin</artifactId>
-          <version>3.4.2</version>
+          <version>3.4.3</version>
           <configuration>
             <skip>true</skip>
           </configuration>