chore(deps): update dependency @antfu/eslint-config to v6

Author: renovate[bot]

package.json

@@ -34,7 +34,7 @@
     "prism-theme-vars": "^0.2.5"
   },
   "devDependencies": {
-    "@antfu/eslint-config": "^5.3.0",
+    "@antfu/eslint-config": "^6.0.0",
     "@eslint/js": "^9.35.0",
     "@eslint/markdown": "^7.2.0",
     "@slidev/cli": "^52.1.0",