doc: add entry to stewards

Author: RafaelGSS

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          |              |