Update login API version (as in 3.x.x)

Author: Pavion

src/main/java/org/openhab/binding/synologysurveillancestation/internal/webapi/request/SynoApiAuth.java

@@ -40,7 +40,7 @@ public class SynoApiAuth extends SynoApiRequest<AuthResponse> {
 
     // API configuration
     private static final String API_NAME = "SYNO.API.Auth";
-    private static final SynoApiConfig API_CONFIG = new SynoApiConfig(API_NAME, API_VERSION_02, API_SCRIPT_AUTH);
+    private static final SynoApiConfig API_CONFIG = new SynoApiConfig(API_NAME, API_VERSION_06, API_SCRIPT_AUTH);
 
     /**
      * @param config