Fix actions/core import for ESM

Author: JoyceZhu

.github/actions/find/src/index.ts

@@ -1,5 +1,5 @@
 import type { AuthContextInput } from "./types.js";
-import core from "@actions/core";
+import * as core from "@actions/core";
 import { AuthContext } from "./AuthContext.js";
 import { findForUrl } from "./findForUrl.js";