chore(deps): update dependency eslint to ~9.21.0 (#671)

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

Author: renovate[bot]

package.json

@@ -85,7 +85,7 @@
     "chai": "^5.0.0",
     "env-cmd": "^10.1.0",
     "esbuild": "^0.25.0",
-    "eslint": "~9.20.0",
+    "eslint": "~9.21.0",
     "eslint-config-prettier": "^10.0.0",
     "eslint-plugin-eslint-comments": "^3.2.0",
     "eslint-plugin-jsdoc": "^50.6.0",