Bump eslint from 9.20.1 to 9.21.0

Bumps [eslint](https://github.com/eslint/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](https://github.com/eslint/eslint/compare/v9.20.1...v9.21.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -61,7 +61,7 @@
     "@eslint/eslintrc": "^3.2.0",
     "@eslint/js": "^9.20.0",
     "chai": "^5.2.0",
-    "eslint": "^9.20.0",
+    "eslint": "^9.21.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-prettier": "^10.0.1",
     "globals": "^15.14.0",