deps: bump flatten-maven-plugin from 1.3.0 to 1.4.0 (#1662)

Bumps [flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@flatten-maven-plugin-1.3.0...1.4.0)

---
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>

pom.xml

@@ -47,7 +47,7 @@
 		<maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
 		<maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
 		<maven-failsafe-plugin.version>3.0.0-M7</maven-failsafe-plugin.version>
-		<maven-flatten-plugin.version>1.3.0</maven-flatten-plugin.version>
+		<maven-flatten-plugin.version>1.4.0</maven-flatten-plugin.version>
 		<maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
 		<maven-jar-plugin.version>3.3.0</maven-jar-plugin.version>
 		<maven-javadoc-plugin.version>3.5.0</maven-javadoc-plugin.version>