Update expiry date in the security policy (#1729)

SECURITY.md

@@ -7,7 +7,7 @@ appreciate your efforts to responsibly disclose your findings. Due to the
 non-funded and open-source nature of the project, we take a best-efforts
 approach when it comes to engaging with security reports.
 
-This document should be considered expired after 2024-10-01. If you are
+This document should be considered expired after 2025-06-01. If you are
 reading this after that date you should try to find an up-to-date version
 in the official source repository.