Fix NullPointerException when logging in

hippo4j-auth/src/main/java/cn/hippo4j/auth/filter/JWTAuthenticationFilter.java

@@ -107,7 +107,7 @@ public class JWTAuthenticationFilter extends UsernamePasswordAuthenticationFilte
     }
 
     @Override
-    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException, ServletException {
+    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException {
         response.setCharacterEncoding("UTF-8");
         response.getWriter().write(JSONUtil.toJsonStr(new ReturnT(-1, "Server Error")));
     }