chore: update to eslint v9

Author: pi0

.eslintignore

@@ -0,0 +1,10 @@
+import unjs from "eslint-config-unjs";
+
+// https://github.com/unjs/eslint-config
+export default unjs({
+  ignores: [],
+  rules: {
+  "unicorn/prevent-abbreviations": 0,
+  "@typescript-eslint/no-non-null-assertion": 0
+},
+});