chore(nextjs): Update dependency next to v15.5.20

Author: renovate[bot]

packages/nextjs/package.json

@@ -92,7 +92,7 @@
   },
   "devDependencies": {
     "crypto-es": "^2.1.0",
-    "next": "15.5.19"
+    "next": "15.5.20"
   },
   "peerDependencies": {
     "next": "^15.2.8 || ^15.3.8 || ^15.4.10 || ^15.5.9 || ^15.6.0-0 || ^16.0.10 || ^16.1.0-0",