### 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
RID ci = easing_draw->get_canvas_item();
	Size2 s = easing_draw->get_size();
	const int point_count = 48;
	const float exp = get_edited_object()->get(get_edited_property());
	const Ref<Font> f = get_theme_font(SNAME("font"), SNAME("Label"));
	int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
	const Color font_color = get_theme_color(is_read_only() ? SNAME("font_uneditable_color") : SNAME("font_color"), SNAME("LineEdit"));
	Color line_color;
	if (dragging) {
		line_color = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
	} else {
		line_color = get_theme_color(is_read_only() ? SNAME("font_uneditable_color") : SNAME("font_color"), SNAME("LineEdit")) * Color(1, 1, 1, 0.9);
	}
	Vector<Point2> points;
	for (int i = 0; i <= point_count; i++) {