Bump flatten-maven-plugin from 1.2.3 to 1.2.4 (#213)

Bumps [flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@flatten-maven-plugin-1.2.3...flatten-maven-plugin-1.2.4)

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

pom.xml

@@ -268,7 +268,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>flatten-maven-plugin</artifactId>
-                    <version>1.2.3</version>
+                    <version>1.2.4</version>
                 </plugin>
 
                 <plugin>