Bump @mui/material from 6.4.5 to 6.4.8 in /client (#48)

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client/package.json

@@ -28,7 +28,7 @@
   "dependencies": {
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
-    "@mui/material": "^6.4.5",
+    "@mui/material": "^6.4.8",
     "axios": "^1.7.9",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",