Update dependency eslint to v9.21.0 (#31)

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

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "@typescript-eslint/parser": "8.24.1",
     "chai": "^5.1.2",
     "chai-exclude": "^3.0.0",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-plugin-import": "2.31.0",
     "eslint-plugin-n": "17.15.1",
     "eslint-plugin-simple-import-sort": "12.1.1",