chore: upgrade dependencies (#2278)

apps/documentation/package.json

@@ -15,7 +15,7 @@
     "@documenso/tailwind-config": "*",
     "@documenso/trpc": "*",
     "@documenso/ui": "*",
-    "next": "^15",
+    "next": "^15.5.7",
     "next-plausible": "^3.12.5",
     "nextra": "^3",
     "nextra-theme-docs": "^3",

apps/openpage-api/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@documenso/prisma": "*",
     "luxon": "^3.7.2",
-    "next": "^15"
+    "next": "^15.5.7"
   },
   "devDependencies": {
     "@types/node": "^20",