meta: move whitlockjc to Collaborator Emeriti list

Jeremy confirmed in email that it would be OK to move them to Emeritus
status.

PR-URL: https://github.com/nodejs/node/pull/27702


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>