Update SECURITY.md to remove 24.x.x support

Remove support indication for version 24.x.x in the security policy.

Author: codehippie1

SECURITY.md

@@ -7,7 +7,6 @@ We actively maintain and provide security updates for the following versions:
 | Version | Supported          |
 | ------- | ------------------ |
 | 25.x.x  | :white_check_mark: |
-| 24.x.x  | :x:                |
 | 20.x.x  | :x:                |
 | < 20.x  | :x:                |