### Godot version

4.1.dev 2e273f0e35800f2bcc7c05db54100caa97928f69

### System information

macOS 13.4

### Issue description

Removing a SpinBox from the node tree using `remove_child` during the line edit text submit signal will crash the engine.

```
handle_crash: Program crashed with signal 11
Engine version: Godot Engine v4.1.dev.custom_build (2e273f0e35800f2bcc7c05db54100caa97928f69)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[1] 1   libsystem_platform.dylib            0x0000000183b5aa24 _sigtramp + 56
[2] Viewport::gui_get_focus_owner() (in godot.macos.editor.arm64) + 32
[3] SpinBox::_line_edit_focus_exit() (in godot.macos.editor.arm64) + 28
[4] CallQueue::_call_function(Callable const&, Variant const*, int, bool) (in godot.macos.editor.arm64) + 336
[5] CallQueue::flush() (in godot.macos.editor.arm64) + 908
[6] SceneTree::physics_process(double) (in godot.macos.editor.arm64) + 244
[7] Main::iteration() (in godot.macos.editor.arm64) + 528
```

### Steps to reproduce

Open the minimal reproduction project, click on the SpinBox, press enter, and the engine crashes.

### Minimal reproduction project

[SpinBoxTextSubmitCrash.zip](https://github.com/godotengine/godot/files/11631081/SpinBoxTextSubmitCrash.zip)

set_value(get_value() - step * mb->get_factor());
					accept_event();
				}
			} break;
			default:
				break;
		}
	}
	if (mb.is_valid() && !mb->is_pressed() && mb->get_button_index() == MouseButton::LEFT) {
		
		range_click_timer->stop();
		_release_mouse();
		drag.allowed = false;
		line_edit->clear_pending_select_all_on_focus();
	}
	Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid() && (mm->get_button_mask().has_flag(MouseButtonMask::LEFT))) {
		if (drag.enabled) {
			drag.diff_y += mm->get_relative().y;
			double diff_y = -0.01 * Math::pow(ABS(drag.diff_y), 1.8) * SIGN(drag.diff_y);
			set_value(CLAMP(drag.base_val + step * diff_y, get_min(), get_max()));
		} else if (drag.allowed && drag.capture_pos.distance_to(mm->get_position()) > 2) {
			Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
			drag.enabled = true;
			drag.base_val = get_value();
			drag.diff_y = 0;
		}
	}
}
void SpinBox::_line_edit_focus_enter() {