Update dependency eslint to v9.21.0

Author: renovate[bot]

package-lock.json

@@ -12,7 +12,7 @@
     "changelog-updater": "2.0.3",
     "concurrently": "9.1.2",
     "cpy-cli": "5.0.0",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-config-prettier": "10.0.1",
     "eslint-plugin-import": "2.31.0",
     "eslint-plugin-prettier": "5.2.3",