Fix unit tests when run with Python 3.12

When running in command line mode, the Gedcom and ProGen importers
were being run before the `gi.require_version` method, causing
Gtk 4.0 to be incorrectly loaded. This caused some unit tests to
fail.

Fixes #13212.

gramps/plugins/importer/importgedcom.py

@@ -39,7 +39,6 @@
 
 _ = glocale.translation.gettext
 from gramps.gen.errors import DbError, GedcomError
-from gramps.gui.glade import Glade
 from gramps.plugins.lib.libmixin import DbMixin
 from gramps.plugins.lib import libgedcom
 from gramps.gen.utils.libformatting import ImportInfo
@@ -98,6 +97,7 @@ def importData(database, filename, user):
         return
 
     if not gramps and ansel and user.uistate:
+        from gramps.gui.glade import Glade
         top = Glade()
         code = top.get_object("codeset")
         code.set_active(0)

gramps/plugins/importer/importprogen.py

@@ -26,6 +26,8 @@
 #
 # -------------------------------------------------------------------------
 import os, time
+import gi
+gi.require_version("Gtk", "3.0")
 from gi.repository import Gtk, Gdk
 
 # ------------------------------------------------------------------------