build: update to latest version of Next.js

Author: nperez0111

docs/app/llms.mdx/[[...slug]]/route.ts

@@ -8,7 +8,7 @@ export const revalidate = false;
 
 export async function GET(
   _req: NextRequest,
-  { params }: { params: Promise<{ slug: string[] }> },
+  { params }: { params: Promise<{ slug?: string[] }> },
 ) {
   const slug = (await params).slug;
   const page = source.getPage(slug);

docs/package.json

@@ -4,10 +4,10 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "next dev --turbo",
+    "dev": "next dev --turbopack",
     "dev:email": "email dev",
     "prebuild:site": "nx run @blocknote/dev-scripts:gen",
-    "build:site": "fumadocs-mdx && next build --turbo",
+    "build:site": "fumadocs-mdx && next build --turbopack",
     "start": "next start",
     "postinstall": "fumadocs-mdx",
     "init-db": "pnpx @better-auth/cli migrate",
@@ -84,7 +84,7 @@
     "fumadocs-typescript": "^4.0.6",
     "fumadocs-ui": "^15.5.4",
     "import-in-the-middle": "^1.14.2",
-    "next": "^15.4.3",
+    "next": "15.5.1",
     "nodemailer": "^6.10.1",
     "partykit": "^0.0.115",
     "pg": "^8.15.5",