♻️ refactor : Improve readability by using HTTP_STATUS.UNAUTHORIZED constant

- Replaced the hard-coded 401 status code with the HTTP_STATUS.UNAUTHORIZED constant.
- This change improves the readability of the code and makes it easier to understand the meaning of the status code.

Related issue: YJU-OKURA#128

Author: dorimu0

src/api/apiUtils.ts

@@ -4,7 +4,7 @@ import HTTP_STATUS from './httpStatus';
 async function fetchWithInterceptors(url: string, options: RequestInit) {
   let response = await fetch(url, options);
 
-  if (response.status === 401) {
+  if (response.status === HTTP_STATUS.UNAUTHORIZED) {
     const refreshToken = localStorage.getItem('refresh_token');
     const refreshResponse = await fetch(
       `${BASE_URLS.gin}/auth/google/refresh-token`,