doc: move joshgav to TSC emeriti list

Josh is focusing on other technologies these days and has moved to the
TSC Emeritus role. He already opened a pull request in the TSC
repository to make this change. This makes the same change in the main
repository.

PR-URL: #17953
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

README.md

@@ -252,8 +252,6 @@ For more information about the governance of the Node.js project, see
 **Fedor Indutny** <fedor.indutny@gmail.com>
 * [jasnell](https://github.com/jasnell) -
 **James M Snell** <jasnell@gmail.com> (he/him)
-* [joshgav](https://github.com/joshgav) -
-**Josh Gavant** <josh.gavant@outlook.com>
 * [joyeecheung](https://github.com/joyeecheung) -
 **Joyee Cheung** <joyeec9h3@gmail.com> (she/her)
 * [mcollina](https://github.com/mcollina) -
@@ -285,6 +283,8 @@ For more information about the governance of the Node.js project, see
 **Chris Dickinson** <christopher.s.dickinson@gmail.com>
 * [isaacs](https://github.com/isaacs) -
 **Isaac Z. Schlueter** <i@izs.me>
+* [joshgav](https://github.com/joshgav) -
+**Josh Gavant** <josh.gavant@outlook.com>
 * [nebrius](https://github.com/nebrius) -
 **Bryan Hughes** <bryan@nebri.us>
 * [orangemocha](https://github.com/orangemocha) -