meta: move stefanmb to Collaborator Emeriti list

I asked Stefan if they would mind being moved to Collaborator Emeritus.
They responded that they were not active in Node.js right now and that
moving them was fine.

PR-URL: #27502
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

Author: Trott

README.md

@@ -445,8 +445,6 @@ For information about the governance of the Node.js project, see
 **Steven R Loomis** <srloomis@us.ibm.com>
 * [starkwang](https://github.com/starkwang) -
 **Weijia Wang** <starkwang@126.com>
-* [stefanmb](https://github.com/stefanmb) -
-**Stefan Budeanu** <stefan@budeanu.com>
 * [targos](https://github.com/targos) -
 **Michaël Zasso** <targos@protonmail.com> (he/him)
 * [thefourtheye](https://github.com/thefourtheye) -
@@ -520,6 +518,8 @@ For information about the governance of the Node.js project, see
 **Robert Kowalski** <rok@kowalski.gd>
 * [romankl](https://github.com/romankl) -
 **Roman Klauke** <romaaan.git@gmail.com>
+* [stefanmb](https://github.com/stefanmb) -
+**Stefan Budeanu** <stefan@budeanu.com>
 * [tellnes](https://github.com/tellnes) -
 **Christian Tellnes** <christian@tellnes.no>
 * [tunniclm](https://github.com/tunniclm) -