refactor: Bump eslint from 9.20.1 to 9.21.0 (#2466)

Author: dependabot[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "codecov": "3.8.3",
     "core-js": "3.40.0",
     "cross-env": "7.0.2",
-    "eslint": "9.20.1",
+    "eslint": "9.21.0",
     "eslint-plugin-expect-type": "0.6.2",
     "eslint-plugin-jsdoc": "50.6.3",
     "express": "4.21.2",