Update dependency eslint-config-next to v15

Author: renovate[bot]

web/package.json

@@ -27,7 +27,7 @@
     "@types/react": "^18.3.20",
     "@types/react-dom": "^18.3.6",
     "eslint": "^8.57.1",
-    "eslint-config-next": "14.2.18",
+    "eslint-config-next": "15.4.3",
     "eslint-config-prettier": "^8.10.0",
     "eslint-plugin-prettier": "^5.2.6",
     "eslint-plugin-unused-imports": "^3.2.0",