Update mantine monorepo to v8.3.9 (#806)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

app/react-app/package-lock.json

@@ -4,8 +4,8 @@
   "private": true,
   "dependencies": {
     "@emotion/react": "11.14.0",
-    "@mantine/core": "8.3.8",
-    "@mantine/hooks": "8.3.8",
+    "@mantine/core": "8.3.9",
+    "@mantine/hooks": "8.3.9",
     "@tabler/icons-react": "3.35.0",
     "@testing-library/jest-dom": "6.9.1",
     "@testing-library/react": "16.3.0",