SEC-1066: Update cas client to 3.1.5

cas/pom.xml

@@ -38,7 +38,7 @@
         <dependency>
             <groupId>org.jasig.cas</groupId>
             <artifactId>cas-client-core</artifactId>
-            <version>3.1.4</version>
+            <version>3.1.5</version>
         </dependency>
         <dependency>
             <groupId>net.sf.ehcache</groupId>