add missing version to roadmap

Author: ildyria

src/pages/roadmap.astro

@@ -8,6 +8,7 @@ const metadata = {
 
 // Release data extracted from releases.md
 const releases = [
+  { version: 'v7.5.4', date: 'Mar 23, 2026', title: 'Hotfix', type: 'enhancement', highlights: ['Live vulnerability check', 'Fix listing of shared albums vulnerability'] },
   { version: 'v7.5.3', date: 'Mar 23, 2026', title: 'Hotfix', type: 'security', highlights: ['Fix XSS in RSS feed'] },
   { version: 'v7.5.2', date: 'Mar 22, 2026', title: 'Camera support & hotfix', type: 'enhancement', highlights: ['Upload from camera support from Frontend', 'Fix SSRF on name resolution to reserved ip space'] },
   { version: 'v7.5.1', date: 'Mar 21, 2026', title: 'Hotfix', type: 'security', highlights: ['Fix SSRF on localhost aliases', 'Support PHP wihout LDAP extension'] },