fix(deps): update dependency next to v15

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@headlessui/react": "^2.1.1",
     "@radix-ui/react-tooltip": "^1.1.2",
-    "next": "^14.2.4",
+    "next": "^15.0.0",
     "nextra": "^2.13.4",
     "nextra-theme-docs": "^2.13.4",
     "react": "^18.3.1",