Bump org.codehaus.mojo:flatten-maven-plugin from 1.5.0 to 1.7.3

Bumps [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.5.0 to 1.7.3.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.5.0...1.7.3)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-version: 1.7.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -64,7 +64,7 @@
 		<xerces.version>2.12.2</xerces.version>
 		<jacoco-maven-plugin.version>0.8.13</jacoco-maven-plugin.version>
 		<exec-maven-plugin.version>3.6.2</exec-maven-plugin.version>
-		<flatten-maven-plugin.version>1.5.0</flatten-maven-plugin.version>
+		<flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
 		<commons-beanutils.version>1.9.4</commons-beanutils.version>
 		<sisu-inject-plexus.version>2.6.0</sisu-inject-plexus.version>