Fix actions/core import for ESM

Author: JoyceZhu

.github/actions/file/src/index.ts

@@ -1,6 +1,6 @@
 import type {Finding, ResolvedFiling, RepeatedFiling} 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 {Issue} from './Issue.js'