Update python-gobject to version 3.40.1 / rev 88 via SR 910106
https://build.opensuse.org/request/show/910106
by user dimstar + dimstar_suse
- Adjust BuildRequires for python_module cairo to python-module
pycairo: the module was renamed 2 years ago.
- Skip build for python2: not supported anymore since 3.38.0. (forwarded request 910099 from yfjiang)