Updated slf4j version in ldap sample

samples/ldap/pom.xml

@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>1.4.3</version>
+            <version>1.5.8</version>
             <scope>runtime</scope>
         </dependency>
     </dependencies>