build(deps): bump org.codehaus.mojo:flatten-maven-plugin (#840)

Author: dependabot[bot]

pom.xml

@@ -336,7 +336,7 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>flatten-maven-plugin</artifactId>
-          <version>1.7.2</version>
+          <version>1.7.3</version>
           <configuration>
             <flattenMode>fatjar</flattenMode>
           </configuration>