chore: update dependency eslint to ^9.21.0

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

Author: renovate[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "diff": "^7.0.0",
     "doctoc": "^2.2.1",
     "duplexer": "^0.1.2",
-    "eslint": "^9.20.1",
+    "eslint": "^9.21.0",
     "eslint-config-google": "^0.14.0",
     "express": "^4.21.2",
     "express-ntlm": "2.7.0",