chore(issue): update security issue template

Author: matteovivona

.github/ISSUE_TEMPLATE/security.md

@@ -1,11 +1,13 @@
 ---
 name: 👮 Security Issue
 about: Responsible Disclosure
+labels: 'security'
+
 ---
 
 ## 👮 [Responsible Disclosure](https://github.com/nodejs/security-wg/blob/master/processes/responsible_disclosure_template.md)
 
 Do not open issues that might have security implications. It is critical that security related issues
 are reported privately so we have time to address them before they become public knowledge.
 
-Vulnerabilities can also be reported by emailing [email protected] 
+Vulnerabilities can also be reported by emailing [email protected]