Update dependency eslint to v9.21.0

Author: renovate[bot]

package.json

@@ -35,7 +35,7 @@
     "aws-sdk": "^2.1599.0",
     "c8": "^10.0.0",
     "chai": "4.4.1",
-    "eslint": "9.15.0",
+    "eslint": "9.21.0",
     "lorem-ipsum": "^2.0.8",
     "mocha": "10.8.2"
   }