Bump flatten-maven-plugin from 1.4.1 to 1.5.0 (#755)

Author: dependabot[bot]

pom.xml

@@ -1317,7 +1317,7 @@
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>flatten-maven-plugin</artifactId>
-            <version>1.4.1</version>
+            <version>1.5.0</version>
             <configuration>
               <updatePomFile>true</updatePomFile>
             </configuration>