doc: add entry to stewards

PR-URL: #51760
Refs: nodejs-private/node-private#514
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/contributing/security-release-process.md

@@ -31,6 +31,7 @@ The current security stewards are documented in the main Node.js
 | NearForm     | Rafael          | 2023-Jun-20  |
 | NearForm     | Rafael          | 2023-Aug-09  |
 | NearForm     | Rafael          | 2023-Oct-13  |
+| NodeSource   | Rafael          | 2024-Feb-14  |
 | Datadog      | Bryan           |              |
 | IBM          | Joe             |              |
 | Platformatic | Matteo          |              |