doc: add shisama to collaborators

PR-URL: #24136
Fixes: #23850
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

Author: Masashi Hirano

README.md

@@ -433,6 +433,8 @@ For information about the governance of the Node.js project, see
 **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) -
 **Roman Reiss** <me@silverwind.io>
 * [srl295](https://github.com/srl295) -