use cache action instead of external cache

Author: Skycoder42

action.yml

@@ -1,15 +1,13 @@
 name: 'Setup Qt environment'
-description: 'Setup Qt from their online installer'
+description: 'Setup Qt by using the prebuilt binaries the Qt-Company provides'
 author: 'Skycoder42'
 inputs: 
  version:
  description: 'The Qt version to download and install. Example: 5.13.1'
  required: true
- default: ''
  platform:
  description: 'A version dependend platform package to be installed. Example: gcc_64'
  required: true
- default: ''
  packages:
  description: 'A comma seperated list of additional packages to be installed. Example: qtnetworkauth,qtwebengine,qt.tools.ifw.32'
  required: false
@@ -22,10 +20,6 @@ inputs:
  description: 'A space seperated list of additional URLs to download modules from. Modules should be layed out as "<url>/<os>_<arch>/qt<version>/<module>"'
  required: false
  default: ''
- cachedir:
- description: 'A path to a Qt installation, downloaded from cache'
- required: false
- default: ''
  clean:
  description: 'Perform a clean installation, ignoring any caches'
  required: false
@@ -46,6 +40,6 @@ outputs:
  outdir:
  description: 'The path where installed files go after installing to installdir'
 runs:
- using: 'node12'
+ using: 'node14'
  main: 'lib/setup-qt.js'