fix: update file-type to 21.3.3 to resolve CVE-2026-31808 and CVE-2026-32630

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: adiologydev

bun.lock

@@ -19,6 +19,7 @@
     "@elysiajs/cors": "^1.4.1",
     "@resvg/resvg-js": "^2.6.2",
     "elysia": "^1.4.28",
+    "file-type": "^21.3.2",
     "satori": "^0.26.0",
     "sharp": "^0.34.5"
   },