fix: upgrade @mui/material from 6.1.1 to 6.1.2

Snyk has created this PR to upgrade @mui/material from 6.1.1 to 6.1.2.

See this package in npm:
@mui/material

See this project in Snyk:
https://app.snyk.io/org/tandapnoelbansikah/project/e44c3c03-c6d7-4295-8cbb-ea33b3c2b530?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

user-frontend/package-lock.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@emotion/react": "^11.13.3",
     "@emotion/styled": "^11.13.0",
-    "@mui/material": "^6.1.1",
+    "@mui/material": "^6.1.2",
     "@testing-library/jest-dom": "^5.17.0",
     "@testing-library/react": "^13.4.0",
     "@testing-library/user-event": "^13.5.0",