chore(deps): update dependency eslint to v9.21.0

Author: renovate[bot]

eslint-config-typescript/package-lock.json

@@ -17,7 +17,7 @@
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "8.24.1",
     "@typescript-eslint/parser": "8.24.1",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-config-prettier": "10.0.1",
     "eslint-plugin-jest": "28.11.0",
     "eslint-plugin-prettier": "5.2.3",