Update Nextjz to 15.2

Author: marcoacierno

frontend/package.json

@@ -27,7 +27,7 @@
     "@python-italia/pycon-styleguide": "0.1.210",
     "@sentry/nextjs": "^8.45.0",
     "@vercel/analytics": "^1.1.1",
-    "@vercel/og": "^0.6.2",
+    "@vercel/og": "^0.6.5",
     "@vercel/speed-insights": "^1.0.12",
     "@xstate/react": "^3.0.1",
     "clsx": "^1.2.1",
@@ -42,7 +42,7 @@
     "graphql-tag": "^2.12.6",
     "marksy": "^8.0.0",
     "moment": "^2.29.1",
-    "next": "15.1.0",
+    "next": "15.2.0",
     "next-cookies": "^2.0.3",
     "pdfkit": "^0.15.1",
     "react": "19.0.0",