Bump docker-maven-plugin from 0.42.0 to 0.42.1

Bumps [docker-maven-plugin](https://github.com/fabric8io/docker-maven-plugin) from 0.42.0 to 0.42.1.
- [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@v0.42.0...v0.42.1)

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

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

build-parent/pom.xml

@@ -121,7 +121,7 @@
         <jacoco.agent.argLine></jacoco.agent.argLine>
 
         <asciidoctor-maven-plugin.version>2.0.0</asciidoctor-maven-plugin.version>
-        <docker-maven-plugin.version>0.42.0</docker-maven-plugin.version>
+        <docker-maven-plugin.version>0.42.1</docker-maven-plugin.version>
         <formatter-maven-plugin.version>2.22.0</formatter-maven-plugin.version>
         <impsort-maven-plugin.version>1.8.0</impsort-maven-plugin.version>
         <maven-invoker-plugin.version>3.5.1</maven-invoker-plugin.version>