feat: add responsible disclosure guidelines to security page

Added a note encouraging users to avoid publicly disclosing vulnerabilities until they have been addressed. This helps ensure security issues are properly evaluated and mitigated before exposure to potential exploitation.

Author: terezavrchovinova

sources/platform/security.md

@@ -44,6 +44,8 @@ Read the Apify Security Whitepaper for a full description of Apify's measures an
 
 If you notice or suspect a potential security breach, please report this immediately to our security team at [[email protected]](mailto:[email protected]), including all the technical details.
 
+Please refrain from disclosing the vulnerability publicly until it has been addressed. This ensures that the issue can be properly evaluated and mitigated before being exposed to potential exploitation.
+
 The total compensation for your report will be highly dependent on the severity, complexity, and exploitability of the vulnerability. Your reports are always verified by our internal security team,
 which also weighs in on various risks associated with that vulnerability and how major of an impact it would have in case we were attacked.