Bump com.google.cloud.tools:jib-maven-plugin from 3.3.2 to 3.4.0 (#667)

Bumps [com.google.cloud.tools:jib-maven-plugin](https://github.com/GoogleContainerTools/jib) from 3.3.2 to 3.4.0.
- [Release notes](https://github.com/GoogleContainerTools/jib/releases)
- [Commits](https://github.com/GoogleContainerTools/jib/commits)

---
updated-dependencies:
- dependency-name: com.google.cloud.tools:jib-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -267,7 +267,7 @@
         <plugin>
           <groupId>com.google.cloud.tools</groupId>
           <artifactId>jib-maven-plugin</artifactId>
-          <version>3.3.2</version>
+          <version>3.4.0</version>
           <configuration>
             <skip>true</skip>
           </configuration>