update react, material

Change-Id: I4ae3cdf25982f0935641bf5846447e9d223563b4
diff --git a/client/src/components/loading.js b/client/src/components/loading.js
index 198b993..dee6e88 100644
--- a/client/src/components/loading.js
+++ b/client/src/components/loading.js
@@ -1,4 +1,4 @@
-import { CircularProgress, Container } from '@material-ui/core';
+import { CircularProgress, Container } from '@mui/material';
 import React from 'react';
 
 export default function LoadingPage() {