Log Message:
py-xdg: Update to 0.27

upstream changes:
-----------------
PyXDG 0.27; October 2020
  o Menu: Fix compatibility with Python >= 3.8.4
  o Menu: Fix several AttributeErrors
  o Menu: Fix duplication of menu entries due when Layout is provided
  o MenuEditor: Fix fromstring typo
  o Certain tests are more independent of external system conditions
  o Standardise shebangs to /usr/bin/env python3