chore: bump @eslint/js from 9.20.0 to 9.21.0 (#627)

Bumps [@eslint/js](https://github.com/eslint/eslint/tree/HEAD/packages/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)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -12,7 +12,7 @@
     "gha-utils": "^0.4.1"
   },
   "devDependencies": {
-    "@eslint/js": "^9.20.0",
+    "@eslint/js": "^9.21.0",
     "@rollup/plugin-node-resolve": "^16.0.0",
     "@rollup/plugin-typescript": "^12.1.2",
     "@types/node": "^22.13.4",