chore(deps): update dependency eslint-config-next to v15

Author: renovate[bot]

packages/code-du-travail-frontend/package.json

@@ -101,7 +101,7 @@
     "cypress-iframe": "^1.0.1",
     "cypress-real-events": "^1.13.0",
     "eslint": "^8",
-    "eslint-config-next": "14.2.5",
+    "eslint-config-next": "15.1.6",
     "eslint-plugin-cypress": "^3.4.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",