audit fix and update http-client (#298)

src/tool-cache.ts

@@ -3,7 +3,7 @@ import * as io from '@actions/io'
 import * as fs from 'fs'
 import * as os from 'os'
 import * as path from 'path'
-import * as httpm from 'typed-rest-client/HttpClient'
+import * as httpm from '@actions/http-client'
 import * as semver from 'semver'
 import * as uuidV4 from 'uuid/v4'
 import {exec} from '@actions/exec/lib/exec'