Update dependency next to v15.5.7 [SECURITY] (#184)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
     "start": "next start"
   },
   "dependencies": {
-    "next": "15.5.4",
+    "next": "15.5.7",
     "react": "19.2.0",
     "react-dom": "19.2.0",
     "sass": "1.93.2",