doc: add Rafael to steward list

PR-URL: #52452
Refs: nodejs-private/security-release#22
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

Author: RafaelGSS

doc/contributing/security-release-process.md

@@ -33,6 +33,7 @@ The current security stewards are documented in the main Node.js
 | NearForm     | Rafael          | 2023-Oct-13  |
 | NodeSource   | Rafael          | 2024-Feb-14  |
 | NodeSource   | Rafael          | 2024-Apr-03  |
+| NodeSource   | Rafael          | 2024-Apr-10  |
 | Datadog      | Bryan           |              |
 | IBM          | Joe             |              |
 | Platformatic | Matteo          |              |