Bump org.codehaus.mojo:flatten-maven-plugin from 1.5.0 to 1.6.0 (#5464)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

liquibase-core/pom.xml

@@ -138,7 +138,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.5.0</version>
+                <version>1.6.0</version>
                 <configuration>
                     <outputDirectory>${project.build.directory}/classes/META-INF/maven/org.liquibase/liquibase-core/</outputDirectory>
                     <flattenedPomFilename>pom.xml</flattenedPomFilename>

pom.xml

@@ -515,7 +515,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.5.0</version>
+                <version>1.6.0</version>
                 <configuration>
                     <updatePomFile>true</updatePomFile>
                     <outputDirectory>${project.build.directory}/flattened-pom</outputDirectory>