Bump org.codehaus.mojo:flatten-maven-plugin from 1.7.2 to 1.7.3 (#378)

Bumps [org.codehaus.mojo:flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@1.7.2...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-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -83,7 +83,7 @@
         <maven-surefire-plugin.version>3.5.4</maven-surefire-plugin.version>
         <maven-resources-plugin.version>3.3.1</maven-resources-plugin.version>
         <maven-assembly-plugin.version>3.7.1</maven-assembly-plugin.version>
-        <flatten-maven-plugin.version>1.7.2</flatten-maven-plugin.version>
+        <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
     </properties>
 
     <modules>