chore(deps): update Next.js version from 15.3.4 to 15.3.6 in package.json and pnpm-lock.yaml

- Updated the Next.js dependency to version 15.3.6 for improved performance and bug fixes.
- Adjusted related dependencies in pnpm-lock.yaml to reflect the new version.

Author: cunoe

package.json

@@ -12,7 +12,7 @@
     "fumadocs-core": "15.5.4",
     "fumadocs-mdx": "11.6.9",
     "fumadocs-ui": "15.5.4",
-    "next": "15.3.4",
+    "next": "15.3.6",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "zod": "^3.25.67"
@@ -29,4 +29,4 @@
     "tailwindcss": "^4.1.10",
     "typescript": "^5.8.3"
   }
-}
+}