doc: add RafaelGSS as latest sec release stewards

PR-URL: #56682
Refs: nodejs-private/security-release#41
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

doc/contributing/security-release-process.md

@@ -35,6 +35,7 @@ The current security stewards are documented in the main Node.js
 | NodeSource   | Rafael          | 2024-Apr-03  |
 | NodeSource   | Rafael          | 2024-Apr-10  |
 | NodeSource   | Rafael          | 2024-Jul-08  |
+| NodeSource   | Rafael          | 2025-Jan-21  |
 | Datadog      | Bryan           |              |
 | IBM          | Joe             |              |
 | Platformatic | Matteo          |              |