chore(deps): update dependency @antfu/eslint-config to v6 (#12)

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

[skip ci]

Author: renovate[bot]

package.json

@@ -59,7 +59,7 @@
     "typescript-eslint": "^8.45.0"
   },
   "devDependencies": {
-    "@antfu/eslint-config": "^5.4.1",
+    "@antfu/eslint-config": "^6.2.0",
     "@eslint/config-inspector": "^1.3.0",
     "@types/node": "^24.9.2",
     "bumpp": "^10.2.3",