fix: broken audit code link

Author: kkkk666

docs/guides/security/audit_reports.mdx

@@ -148,8 +148,8 @@ V4 upgrade audits for the Babylon Genesis v4 Upgrade are conducted by [Coinspect
     {() => (
       <Card
         title="Halborn Babylon Genesis Audit Report"
-        to={new URL('/assets/files/Babylon-Genesis_SSC_code_audit_2026_01.pdf', window.location.origin).href}
-        description="Halborn Babylon Genesis Audit Report (Jan 2026)"
+        to={new URL('/assets/files/Babylon-Genesis_SSC_code_audit_2025_12.pdf', window.location.origin).href}
+        description="Halborn Babylon Genesis Audit Report (Dec 2025)"
         target="_blank"
         rel="noopener noreferrer"
       />