text: Title: Get_ee_stac_list() fails
  Body: <!-- Please search existing issues to avoid creating duplicates. -->
  
  ### Environment Information
  
  -   geemap version: 0.11.0
  -   Python version: 3.7
  -   Operating System: On Google Colab
  
  ### Description
  
  Hi, when trying to run datasets.get_ee_stac_list() it returns []
  
  The URL  https://earthengine-stac.storage.googleapis.com/catalog/catalog.json is accessible, so unsure why it returns a blank list. 
  
  Thanks