chore: update eslint to v9

Author: pi0

.eslintignore

@@ -0,0 +1,13 @@
+import unjs from "eslint-config-unjs";
+
+// https://github.com/unjs/eslint-config
+export default unjs({
+  ignores: [],
+  rules: {
+  "no-undef": 0,
+  "unicorn/prefer-module": 0,
+  "unicorn/prefer-top-level-await": 0,
+  "unicorn/no-null": 0,
+  "@typescript-eslint/no-unused-vars": 0
+},
+});