test: change callback function to arrow function

PR-URL: https://github.com/nodejs/node/pull/24421


Reviewed-By: Ouyang Yadong <oyydoibh@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>