gnu: python-pygobject: Update to 3.34.0.
* gnu/packages/glib.scm (python-pygobject): Update to 3.34.0.
[source](modules, snippet): New fields. Delete failing tests identified by
commit
622d702f7eba3.
[build-system]: Change to MESON-BUILD-SYSTEM.
[arguments]: Remove.
[native-inputs]: Remove WHICH and DBUS.
(python2-pygobject)[build-system]: Change to PYTHON-BUILD-SYSTEM.
[arguments]: New field. Copy old phase from python-pygobject.
[native-inputs]: Remove WHICH and DBUS.
(python-pygobject-3.34.0): Remove variable.