Bump docker-maven-plugin from 0.39.1 to 0.40.0

Bumps [docker-maven-plugin](https://github.com/fabric8io/docker-maven-plugin) from 0.39.1 to 0.40.0.
- [Release notes](https://github.com/fabric8io/docker-maven-plugin/releases)
- [Changelog](https://github.com/fabric8io/docker-maven-plugin/blob/master/doc/changelog.md)
- [Commits](fabric8io/docker-maven-plugin@v0.39.1...v0.40.0)

---
updated-dependencies:
- dependency-name: io.fabric8:docker-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

exist-docker/pom.xml

@@ -197,7 +197,7 @@
             <plugin>
                 <groupId>io.fabric8</groupId>
                 <artifactId>docker-maven-plugin</artifactId>
-                <version>0.39.1</version>
+                <version>0.40.0</version>
                 <configuration>
                   <verbose>true</verbose>
                     <images>