fix(deps): update dependency next to v15

Author: renovate[bot]

package.json

@@ -41,7 +41,7 @@
     "markdown-to-jsx": "^7.4.0",
     "marked": "5.1.2",
     "motion": "^12.11.0",
-    "next": "^14.2.5",
+    "next": "^15.0.0",
     "next-image-export-optimizer": "^1.12.3",
     "next-query-params": "^5.0.0",
     "next-sitemap": "^4.2.3",