text: Title: Split excel sheets to new workbooks fails
  Body: #### OS: WSL2/Linux
  #### Versions of xlwings and Python: 0.27.7 and Python 3.9
  
  I am trying to create new workbooks from worksheets of a workbook. Eventually I want to integrate this step in a Lambda function that runs on AWS. Testing the minimal code below on WSL2 and AWS Lambda, I ran into the same error shown below. This function worked with no errors on MacOS Monterey (v12.2.1).
  
  ```python
  ERROR:root:'NoneType' object has no attribute 'apps'
  Traceback (most recent call last):
    File "/mnt/c/Users/kbuddika/Documents/Alamar_Repos/Benchling-Automation/test.py", line 33, in <module>
      sheet_names = split_excel_file(excel_file="sigTune_data_767dcc9fbaa91d83.xlsx")
    File "/mnt/c/Users/kbuddika/Documents/Alamar_Repos/Benchling-Automation/test.py", line 15, in split_excel_file
      with xw.App(visible=False) as app:
    File "/home/kbuddika/miniconda3/lib/python3.9/site-packages/xlwings/main.py", line 279, in __init__
      self.impl = engines.active.apps.add(
  AttributeError: 'NoneType' object has no attribute 'apps'
  ```
  
  Here is the code I am trying.
  
  ```python
  import xlwings as xw
  import logging
  
  def split_excel_file(excel_file: str) -> list:
      try:
          sheet_names = list()
          with xw.App(visible=False) as app:
              wb = app.books.open(excel_file)
              
              for sheet in wb.sheets:
                  sheet_names.append(f"{sheet.name}.xlsx")
                  wb_new = app.books.add()
                  sheet.copy(after=wb_new.sheets[0])
                  wb_new.sheets[0].delete()
                  wb_new.save(f"{sheet.name}.xlsx")
                  wb_new.close()
          
          return sheet_names
      
      except Exception as error:
          logging.error(error)
          raise
      
  if __name__ == "__main__":
      sheet_names = split_excel_file(excel_file="myexcel_file.xlsx")
      print(sheet_names)
  ```
  
  Can someone please let me know a potential solution to get this integrated on AWS Lambda? 