[pom] Update freemarker to 2.3.28

Author: hazendaz

pom.xml

@@ -95,7 +95,7 @@
     <dependency>
       <groupId>org.freemarker</groupId>
       <artifactId>freemarker</artifactId>
-      <version>2.3.27-incubating</version>
+      <version>2.3.28</version>
     </dependency>
 
     <!-- TEST -->