Bump @material-ui/core from 4.5.1 to 4.12.4 in /frontend (#238)

Bumps [@material-ui/core](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui) from 4.5.1 to 4.12.4.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v4.12.4/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/v4.12.4/packages/material-ui)

---
updated-dependencies:
- dependency-name: "@material-ui/core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -3,7 +3,7 @@
     "version": "0.1.0",
     "private": true,
     "dependencies": {
-      "@material-ui/core": "^4.5.0",
+      "@material-ui/core": "^4.12.4",
       "@material-ui/icons": "^4.11.3",
       "axios": "^0.27.2",
       "prop-types": "^15.8.1",