doc: move shigeki to emeritus

In email, Shigeki Ohtsu indicated that a move to emeritus would be
appropriate at this time. I'm especially grateful for the crypto and
security work over the years, and I'm sure I'm not the only one.

PR-URL: #36093
Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

README.md

@@ -402,8 +402,6 @@ For information about the governance of the Node.js project, see
 **Santiago Gimeno** <santiago.gimeno@gmail.com>
 * [seishun](https://github.com/seishun) -
 **Nikolai Vavilov** <vvnicholas@gmail.com>
-* [shigeki](https://github.com/shigeki) -
-**Shigeki Ohtsu** <ohtsu@ohtsu.org> (he/him)
 * [shisama](https://github.com/shisama) -
 **Masashi Hirano** <shisama07@gmail.com> (he/him)
 * [silverwind](https://github.com/silverwind) -
@@ -547,6 +545,8 @@ For information about the governance of the Node.js project, see
 **Sam Roberts** <vieuxtech@gmail.com>
 * [sebdeckers](https://github.com/sebdeckers) -
 **Sebastiaan Deckers** <sebdeckers83@gmail.com>
+* [shigeki](https://github.com/shigeki) -
+**Shigeki Ohtsu** <ohtsu@ohtsu.org> (he/him)
 * [stefanmb](https://github.com/stefanmb) -
 **Stefan Budeanu** <stefan@budeanu.com>
 * [tellnes](https://github.com/tellnes) -