Fix namespace schema version in CAS sample.

samples/cas/src/main/webapp/WEB-INF/applicationContext-security.xml

@@ -4,7 +4,7 @@
     xmlns:sec="http://www.springframework.org/schema/security"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
-                        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.0.xsd">
+                        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd">
 
     <bean id="springSecurityFilterChain" class="org.springframework.security.web.FilterChainProxy">
         <sec:filter-chain-map path-type="ant">