fix(deps): replace dependency @material-ui/core with @mui/material ^5.0.0

Author: renovate[bot]

package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "@fancyapps/fancybox": "^3.5.7",
-    "@material-ui/core": "^4.2.1",
+    "@mui/material": "^5.0.0",
     "@mitodl/iso-3166-2": "^1.0.1",
     "@sentry/browser": "^6.4.1",
     "@sentry/webpack-plugin": "^1.18.3",