Bump GWT to 2.12.2

Author: niloc132

pom.xml

@@ -12,7 +12,7 @@
         <maven.build.timestamp.format>yyyy-MM-dd</maven.build.timestamp.format>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <gwt.version>2.12.1</gwt.version>
+        <gwt.version>2.12.2</gwt.version>
 
         <junit.version>4.13.2</junit.version>