SEC-1686: Upgrade to Spring 3.0.6

pom.xml

@@ -615,7 +615,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <spring.version>3.0.3.RELEASE</spring.version>
+        <spring.version>3.0.6.RELEASE</spring.version>
         <jstl.version>1.1.2</jstl.version>
         <jetty.version>6.1.22</jetty.version>
     </properties>