docs: update security url to link to central policy

Author: ismisepaul

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -12,7 +12,7 @@ for general questions. If you have a question or an unconfirmed bug , please
 visit the [forums](https://discuss.elastic.co/c/apm).
 
 For security vulnerabilities please only send reports to security@elastic.co.
-See https://www.elastic.co/community/security for more information.
+See https://github.com/elastic/.github/blob/main/SECURITY.md for more information.
 
 Please fill in the following details to help us reproduce the bug:
 -->