Fix actions/core import for ESM

Author: JoyceZhu

.github/actions/fix/src/index.ts

@@ -1,6 +1,6 @@
 import type { Issue as IssueInput, Fixing } from "./types.d.js";
 import process from "node:process";
-import core from "@actions/core";
+import * as core from "@actions/core";
 import { Octokit } from "@octokit/core";
 import { throttling } from "@octokit/plugin-throttling";
 import { assignIssue } from "./assignIssue.js";