meta: consolidate AUTHORS entries for gabrielschulhof

PR-URL: https://github.com/nodejs/node/pull/40420


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>