Updated GitHub issue template links.

Thanks to atlantsecurity and xet7 !

Related #3598

.github/ISSUE_TEMPLATE.md

@@ -1,8 +1,7 @@
 ## Issue
 
 Add these issues to elsewhere:
-- Snap: https://github.com/wekan/wekan-snap/issues
-- LDAP: https://github.com/wekan/wekan-ldap/issues
+- SECURITY ISSUES: https://github.com/wekan/wekan/blob/master/SECURITY.md
 - UCS: https://github.com/wekan/univention/issues
 
 Other Wekan issues can be added here.