Bump @mantine/core from 7.17.1 to 8.3.2 in /frontend

Bumps [@mantine/core](https://github.com/mantinedev/mantine/tree/HEAD/packages/@mantine/core) from 7.17.1 to 8.3.2.
- [Release notes](https://github.com/mantinedev/mantine/releases)
- [Changelog](https://github.com/mantinedev/mantine/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mantinedev/mantine/commits/8.3.2/packages/@mantine/core)

---
updated-dependencies:
- dependency-name: "@mantine/core"
  dependency-version: 8.3.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -10,7 +10,7 @@
     "format": "npx prettier . --write"
   },
   "dependencies": {
-    "@mantine/core": "^7.17.0",
+    "@mantine/core": "^8.3.2",
     "@mantine/hooks": "^7.16.1",
     "@mantine/notifications": "^7.17.1",
     "@next/third-parties": "^15.2.0",