fix(deps): update dependency @netlify/plugin-nextjs to ^5.15.8 (#3414)

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

Author: renovate[bot]

e2e-report/package-lock.json

@@ -9,7 +9,7 @@
     "lint": "eslint"
   },
   "dependencies": {
-    "@netlify/plugin-nextjs": "^5.15.7",
+    "@netlify/plugin-nextjs": "^5.15.8",
     "next": "^15.5.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"