refactor(security): simplify logout method parameters

src/main/java/de/szut/lf8_starter/security/KeycloakLogoutHandler.java

@@ -25,10 +25,10 @@ public class KeycloakLogoutHandler implements LogoutHandler {
 
     @Override
     public void logout(HttpServletRequest request, HttpServletResponse response, Authentication auth) {
-        logout(request, auth);
+        logout(auth);
     }
 
-    public void logout(HttpServletRequest request, Authentication auth) {
+    public void logout(Authentication auth) {
         logoutFromKeycloak((OidcUser) auth.getPrincipal());
     }