### 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
EditorPropertyArray *editor = memnew(EditorPropertyArray);
			editor->setup(Variant::PACKED_FLOAT64_ARRAY);
			return editor;
		} break;
		case Variant::PACKED_STRING_ARRAY: {
			EditorPropertyArray *editor = memnew(EditorPropertyArray);
			editor->setup(Variant::PACKED_STRING_ARRAY);
			return editor;
		} break;
		case Variant::PACKED_VECTOR2_ARRAY: {
			EditorPropertyArray *editor = memnew(EditorPropertyArray);
			editor->setup(Variant::PACKED_VECTOR2_ARRAY);
			return editor;
		} break;
		case Variant::PACKED_VECTOR3_ARRAY: {
			EditorPropertyArray *editor = memnew(EditorPropertyArray);
			editor->setup(Variant::PACKED_VECTOR3_ARRAY);
			return editor;
		} break;
		case Variant::PACKED_COLOR_ARRAY: {
			EditorPropertyArray *editor = memnew(EditorPropertyArray);
			editor->setup(Variant::PACKED_COLOR_ARRAY);
			return editor;
		} break;
		default: {
		}
	}
	return nullptr;
}