meta: move Fishrock123 to emeritus

I've moved on. I do not wish to be responsible for anything here and
have been inactive for more than a year.

PR-URL: https://github.com/nodejs/node/pull/40596


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Nitzan Uziely <linkgoron@gmail.com>