message: fix(api): fix format string in module slot assertion
diff: @@ -222,7 +222,7 @@ class Deck(UserDict):
  else:
  raise AssertionError(
  f'module {module_name} cannot be loaded'
  - ' into slot {location}')
  + f' into slot {location}')
  else:
  valid_slots = [slot['id'] for slot in self.slots if module_name
  in slot['compatibleModules']]
  