doc: add Rafael to the last security release

PR-URL: #53769
Refs: nodejs-private/security-release#29
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/contributing/security-release-process.md

@@ -34,6 +34,7 @@ The current security stewards are documented in the main Node.js
 | NodeSource   | Rafael          | 2024-Feb-14  |
 | NodeSource   | Rafael          | 2024-Apr-03  |
 | NodeSource   | Rafael          | 2024-Apr-10  |
+| NodeSource   | Rafael          | 2024-Jul-08  |
 | Datadog      | Bryan           |              |
 | IBM          | Joe             |              |
 | Platformatic | Matteo          |              |