fix: update SECURITY.md source location (#2163)

Author: jonchurch

en/resources/contributing.md

@@ -296,7 +296,7 @@ not need high
 visibility or maintainer input. 
 ## Security Policies and Procedures
 
-<!-- SRC: expressjs/express SECURITY.md -->
+<!-- SRC: expressjs/.github SECURITY.md -->
 
 This document outlines security procedures and general policies for the Express
 project.