py: Various flake8 cleanups

None of these are particularly significant, but they do get the CI
output clean.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

gio/gdbus-2.0/codegen/utils.py

@@ -23,6 +23,7 @@ import distutils.version
 import os
 import sys
 
+
 # pylint: disable=too-few-public-methods
 class Color:
     """ANSI Terminal colors"""