fix(deps): update mantine monorepo to v8 (major) (#3022)

Co-authored-by: homarr-renovate[bot] <158783068+homarr-renovate[bot]@users.noreply.github.com>
Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

packages/forms-collection/package.json

@@ -29,7 +29,7 @@
     "@homarr/notifications": "workspace:^0.1.0",
     "@homarr/translation": "workspace:^0.1.0",
     "@homarr/validation": "workspace:^0.1.0",
-    "@mantine/core": "^7.17.7",
+    "@mantine/core": "^8.0.0",
     "react": "19.1.0",
     "zod": "^3.24.4"
   },