Update dependency next to v15 [SECURITY]

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "graphemer": "^1.4.0",
     "jotai": "^2.7.1",
     "jotai-location": "^0.5.4",
-    "next": "14.2.26",
+    "next": "15.5.15",
     "openapi-fetch": "^0.9.3",
     "openapi-typescript-helpers": "^0.0.7",
     "react": "^18",