chore(deps): update actions/setup-node action to v6

package.json

@@ -18,8 +18,8 @@
     "clsx": "^2.1.1",
     "cssnano": "^7.1.0",
     "date-fns": "^4.1.0",
-    "lucide-react": "^0.552.0",
+    "lucide-react": "^0.548.0",
-    "next": "^16.0.0",
+    "next": "^15.4.1",
     "next-plausible": "^3.12.4",
     "postcss-flexbugs-fixes": "^5.0.2",
     "postcss-preset-env": "^10.2.4",
@@ -37,7 +37,7 @@
     "@types/react": "19.2.2",
     "@types/react-dom": "19.2.2",
     "eslint": "9.39.0",
-    "eslint-config-next": "16.0.1",
+    "eslint-config-next": "15.5.6",
     "eslint-config-prettier": "10.1.8",
     "postcss": "8.5.6",
     "tailwindcss": "4.1.16",