Bump org.codehaus.mojo:flatten-maven-plugin from 1.5.0 to 1.6.0

Bumps [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.5.0...1.6.0)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -207,7 +207,7 @@
     <netbeans.checkstyle.format>true</netbeans.checkstyle.format>
     <animal-sniffer-maven-plugin.version>1.23</animal-sniffer-maven-plugin.version>
     <build-helper-maven-plugin.version>3.5.0</build-helper-maven-plugin.version>
-    <flatten-maven-plugin.version>1.5.0</flatten-maven-plugin.version>
+    <flatten-maven-plugin.version>1.6.0</flatten-maven-plugin.version>
     <l10n-maven-plugin.version>1.0.0</l10n-maven-plugin.version>
     <license-maven-plugin.version>2.3.0</license-maven-plugin.version>
     <maven-antrun-plugin.version>3.1.0</maven-antrun-plugin.version>