fix: Fix React Server Components CVE vulnerabilities (#168)

Author: malewis5

frontend/package.json

@@ -20,7 +20,7 @@
     "@vercel/speed-insights": "^1.2.0",
     "autoprefixer": "^10.4.22",
     "date-fns": "^4.1.0",
-    "next": "^15.5.7",
+    "next": "15.5.9",
     "next-sanity": "^10.1.4",
     "postcss": "^8.5.6",
     "react": "^19.2.1",