Log Message:
py-gobject3: updated to 3.28.2

3.28.2:
* setup.py: Don't install the test C extension when it's built.
* setup.py: Always define PY_SSIZE_T_CLEAN.
* Fix __str__ return type of Gtk.TreePath with depth == 0.
* Fix a crash when setting a str property with a value containing surrogates.
* tests: Fix a potential crash during tests