Update expiry date in the security policy

Signed-off-by: Eric Cornelissen <ericornelissen@gmail.com>

SECURITY.md

@@ -6,7 +6,7 @@ The maintainers of the `ades` project take security issues seriously. We appreci
 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 2024-12-31. If you are reading this after that date
+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.
 
 ## Supported Versions