Bump org.codehaus.mojo:flatten-maven-plugin from 1.5.0 to 1.8.0

Bumps [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.5.0 to 1.8.0.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.5.0...1.8.0)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -84,7 +84,7 @@
 		<maven-javadoc-plugin.version>3.11.2</maven-javadoc-plugin.version>
 		<maven-source-plugin.version>3.3.0</maven-source-plugin.version>
 		<jacoco-maven-plugin.version>0.8.10</jacoco-maven-plugin.version>
-		<flatten-maven-plugin.version>1.5.0</flatten-maven-plugin.version>
+		<flatten-maven-plugin.version>1.8.0</flatten-maven-plugin.version>
 		<maven-deploy-plugin.version>3.1.1</maven-deploy-plugin.version>
 		<asciidoctor-maven-plugin.version>2.2.3</asciidoctor-maven-plugin.version>
 		<maven-assembly-plugin.version>3.7.0</maven-assembly-plugin.version>