Use built-in library functions in preference to custom implementations

- Use built-in `hashFiles` function included in '@actions/globv0.2.0'
- Use `downloadTool` and `extractZip` functions from '@actions/tool-cache'

package.json

@@ -29,10 +29,8 @@
     "@actions/exec": "1.1.0",
     "@actions/glob": "0.2.0",
     "@actions/http-client": "1.0.11",
-    "@actions/io": "1.1.1",
     "@actions/tool-cache": "1.7.1",
-    "string-argv": "0.3.1",
-    "unzipper": "0.10.11"
+    "string-argv": "0.3.1"
   },
   "devDependencies": {
     "@types/jest": "26.0.23",