Wizards: Bump install-dev-package to v1.6

We were having issues with the download of the Qt Creator packages
failing. The new version of the install-dev-package script has more
error output that might help with tracking down the issue as it
is intermittent.

Change-Id: I677bbf893215a056bea96feecef9bcd241cf85d6
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

share/qtcreator/templates/wizards/qtcreatorplugin/github_workflows_build_cmake.yml

@@ -150,7 +150,7 @@ jobs:
 
         execute_process(COMMAND ${qt_dir}/bin/qmake -query)
     - name: Download Qt Creator
-      uses: qt-creator/install-dev-package@v1.2
+      uses: qt-creator/install-dev-package@v1.6
       with:
         version: ${{ env.QT_CREATOR_VERSION }}
         unzip-to: 'qtcreator'