update parent pom to 6.5

Author: hboutemy

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.codehaus.plexus</groupId>
     <artifactId>plexus</artifactId>
-    <version>5.1</version>
+    <version>6.5</version>
   </parent>
 
   <artifactId>plexus-cipher</artifactId>
@@ -32,6 +32,7 @@
 
   <properties>
     <javaVersion>7</javaVersion>
+    <project.build.outputTimestamp>2020-01-20T18:52:37Z</project.build.outputTimestamp>
   </properties>
 
   <build>