Bump downshift from 8.5.0 to 9.0.4 in /app/assets

Bumps [downshift](https://github.com/downshift-js/downshift) from 8.5.0 to 9.0.4.
- [Release notes](https://github.com/downshift-js/downshift/releases)
- [Changelog](https://github.com/downshift-js/downshift/blob/master/CHANGELOG.md)
- [Commits](downshift-js/downshift@v8.5.0...v9.0.4)

---
updated-dependencies:
- dependency-name: downshift
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

app/assets/package.json

@@ -38,7 +38,7 @@
     "bulma-switch": "^2.0.0",
     "bulma-toast": "^2.4.4",
     "classnames": "^2.5.1",
-    "downshift": "^8.5.0",
+    "downshift": "^9.0.4",
     "edtf": "^4.6.0",
     "esbuild-plugin-svgr": "^2.1.0",
     "faker": "^5.5.3",