build(deps-dev): bump the eslint group in /test/app with 3 updates

Bumps the eslint group in /test/app with 3 updates: [@eslint/js](https://github.com/eslint/eslint/tree/HEAD/packages/js), [@types/eslint__js](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/eslint__js) and [eslint](https://github.com/eslint/eslint).


Updates `@eslint/js` from 9.20.0 to 9.21.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/commits/v9.21.0/packages/js)

Updates `@types/eslint__js` from 8.42.3 to 9.14.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/eslint__js)

Updates `@types/eslint__js` from 8.42.3 to 9.14.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/eslint__js)

Updates `eslint` from 9.20.1 to 9.21.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.20.1...v9.21.0)

---
updated-dependencies:
- dependency-name: "@eslint/js"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: eslint
- dependency-name: "@types/eslint__js"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: eslint
- dependency-name: "@types/eslint__js"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: eslint
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: eslint
...

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

test/app/package.json

@@ -21,10 +21,10 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@eslint/js": "^9.20.0",
-    "@types/eslint__js": "^8.42.3",
+    "@eslint/js": "^9.21.0",
+    "@types/eslint__js": "^9.14.0",
     "@types/node": "^22.13.5",
-    "eslint": "^9.20.1",
+    "eslint": "^9.21.0",
     "ts-node": "^10.9.2",
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.24.1"