doc: include last security release date

PR-URL: nodejs#44794
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: vdeturckheim

doc/contributing/security-release-process.md

@@ -25,7 +25,7 @@ The current security stewards are documented in the main Node.js
 | Datadog    | Bryan           | 2022-Jan-10  |
 | RH and IBM | Joe             | 2022-Mar-18  |
 | NearForm   | Matteo / Rafael | 2022-Jul-07  |
-| Datadog    | Vladimir        |              |
+| Datadog    | Vladimir        | 2022-Sep-23  |
 | NodeSource | Juan            |              |
 | RH and IBM | Michael         |              |