chore: Clean-up missing imports for tests (#505)

Noticed had missing imports in tests, this adds them and orders imports consistently. Not sure why eslint missed this.

sources/test/jest/cache-cleanup.test.ts

@@ -1,8 +1,9 @@
 import * as exec from '@actions/exec'
-import * as core from '@actions/core'
 import * as glob from '@actions/glob'
 import fs from 'fs'
 import path from 'path'
+import {expect, test, jest} from '@jest/globals'
+
 import {CacheCleaner} from '../../src/caching/cache-cleaner'
 
 jest.setTimeout(120000)