Add definitions to known current versions

CURA-8468

cura/CuraApplication.py

@@ -471,6 +471,7 @@ class CuraApplication(QtApplication):
                 ("definition_changes", InstanceContainer.Version * 1000000 + self.SettingVersion):              (self.ResourceTypes.DefinitionChangesContainer, "application/x-uranium-instancecontainer"),
                 ("variant", InstanceContainer.Version * 1000000 + self.SettingVersion):                         (self.ResourceTypes.VariantInstanceContainer, "application/x-uranium-instancecontainer"),
                 ("setting_visibility", SettingVisibilityPresetsModel.Version * 1000000 + self.SettingVersion):  (self.ResourceTypes.SettingVisibilityPreset, "application/x-uranium-preferences"),
+                ("machine", 2):                                                                                 (Resources.DefinitionContainers, "application/x-uranium-definitioncontainer")
             }
         )