### 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
if (read_only) {
		return;
	}
	const Ref<InputEventMouseMotion> mm = p_ev;
	if (mm.is_valid()) {
		bool expand_was_hovered = expand_hovered;
		expand_hovered = expand_rect.has_point(mm->get_position());
		if (expand_hovered != expand_was_hovered) {
			queue_redraw();
		}
		if (!expand_hovered) {
			for (int i = 0; i < flag_rects.size(); i++) {
				if (flag_rects[i].has_point(mm->get_position())) {
					
					hovered_index = i;
					queue_redraw();
					return;
				}
			}
		}
		
		if (hovered_index != -1) {
			hovered_index = -1;
			queue_redraw();
		}