[Godot 4] Make `update_mode` property an enum drop-down in editor inspector

[lihop]

The update_mode property should be shown as an enumeration drop-down in the editor inspector.

Expected	Actual

There may be a way to achieve this inside _bind_methods() otherwise implementing an override for _get_property_list() might be another way to do this.

[lihop]

Closed by 9f269ae.