fix(deps): update dependency next to v15

Author: renovate[bot]

Diff for: package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@react-email/components": "0.0.22",
     "clsx": "^2.1.1",
-    "next": "14.2.5",
+    "next": "15.0.4",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "react-email": "2.1.6",