### Godot version

4.0.beta13 (caacade56)

### System information

Windows 10

### Issue description

Seems like this was missed in #62011 and #70540. `@export_multiline` should also support the PackedStringArray datatype on top of Array[String] and Dictionary, but it doesn't, instead giving the error `"@export_multiline" annotation requires a variable of type "String" but type "PackedStringArray" was given instead.`

### Steps to reproduce

Create a PackedStringArray with the `@export_multiline` annotation.
```gdscript
@export_multiline var npc_dialog: PackedStringArray
```

### Minimal reproduction project

N/A
Basis val = get_edited_object()->get(get_edited_property());
	setting = true;
	spin[0]->set_value(val[0][0]);
	spin[1]->set_value(val[0][1]);
	spin[2]->set_value(val[0][2]);
	spin[3]->set_value(val[1][0]);
	spin[4]->set_value(val[1][1]);
	spin[5]->set_value(val[1][2]);
	spin[6]->set_value(val[2][0]);
	spin[7]->set_value(val[2][1]);
	spin[8]->set_value(val[2][2]);
	setting = false;
}
void EditorPropertyBasis::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			const Color *colors = _get_property_colors();
			for (int i = 0; i < 9; i++) {
				spin[i]->add_theme_color_override("label_color", colors[i % 3]);
			}
		} break;
	}
}
void EditorPropertyBasis::_bind_methods() {
}
void EditorPropertyBasis::setup(double p_min, double p_max, double p_step, bool p_hide_slider, const String &p_suffix) {