doc: move gibfahn to emeritus

Asked Gibson in email if he should be moved to emeritus and he indicated
it was a good idea.

PR-URL: #34190
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

README.md

@@ -307,8 +307,6 @@ For information about the governance of the Node.js project, see
 **Jiawen Geng** <technicalcute@gmail.com>
 * [GeoffreyBooth](https://github.com/geoffreybooth) -
 **Geoffrey Booth** <webmaster@geoffreybooth.com> (he/him)
-* [gibfahn](https://github.com/gibfahn) -
-**Gibson Fahnestock** <gibfahn@gmail.com> (he/him)
 * [gireeshpunathil](https://github.com/gireeshpunathil) -
 **Gireesh Punathil** <gpunathi@in.ibm.com> (he/him)
 * [guybedford](https://github.com/guybedford) -
@@ -460,6 +458,8 @@ For information about the governance of the Node.js project, see
 **Alexander Makarenko** <estliberitas@gmail.com>
 * [firedfox](https://github.com/firedfox) -
 **Daniel Wang** <wangyang0123@gmail.com>
+* [gibfahn](https://github.com/gibfahn) -
+**Gibson Fahnestock** <gibfahn@gmail.com> (he/him)
 * [glentiki](https://github.com/glentiki) -
 **Glen Keane** <glenkeane.94@gmail.com> (he/him)
 * [iarna](https://github.com/iarna) -