doc: updated security stewards

Signed-off-by: Michael Dawson <[email protected]>

PR-URL: #45005
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: mhdawson

README.md

@@ -781,6 +781,12 @@ releases on a rotation basis as outlined in the
   * [vdeturckheim](https://github.com/vdeturckheim) -
     **Vladimir de Turckheim** <<[email protected]>> (he/him)
 * NearForm
+  * [RafaelGSS](https://github.com/RafaelGSS) -
+    **Rafael Gonzaga** <<[email protected]>> (he/him)
+* NodeSource
+  * [juanarbol](https://github.com/juanarbol) -
+    **Juan José Arboleda** <<[email protected]>> (he/him)
+* Platformatic
   * [mcollina](https://github.com/mcollina) -
     **Matteo Collina** <<[email protected]>> (he/him)
 * Red Hat and IBM