### Godot version

v4.0.3.stable.official [5222a99f5]
Master [6101240231600c871f5c5473872532c68ea3268c] (confirmed by https://github.com/godotengine/godot/issues/77666#issuecomment-1568952502)

### System information

Window 10

### Issue description

References are not unreferenced at the end of `if` scopes.

### Steps to reproduce

Copy, paste and run the snippet below, check the results:

```gdscript
extends Node


func _ready() -> void:
  var ref := RefCounted.new()
  var ref_count : int

  # OK
  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # OK
  if true:
    var temp := ref
    temp = null

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)

  # FAIL
  if true:
    var temp := ref

  ref_count = ref.get_reference_count()
  print('Expected: 1, Result: %d' % ref_count)
```

Output example:

```
Expected: 1, Result: 1
Expected: 1, Result: 1
Expected: 1, Result: 2
```

### Minimal reproduction project

N/A
push_text("Self(");
	if (p_self->current_class->identifier != nullptr) {
		print_identifier(p_self->current_class->identifier);
	} else {
		push_text("<main class>");
	}
	push_text(")");
}
void GDScriptParser::TreePrinter::print_signal(SignalNode *p_signal) {
	push_text("Signal ");
	print_identifier(p_signal->identifier);
	push_text("( ");
	for (int i = 0; i < p_signal->parameters.size(); i++) {
		print_parameter(p_signal->parameters[i]);
	}
	push_line(" )");
}
void GDScriptParser::TreePrinter::print_subscript(SubscriptNode *p_subscript) {
	print_expression(p_subscript->base);
	if (p_subscript->is_attribute) {
		push_text(".");
		print_identifier(p_subscript->attribute);
	} else {
		push_text("[ ");
		print_expression(p_subscript->index);
		push_text(" ]");
	}
}
void GDScriptParser::TreePrinter::print_statement(Node *p_statement) {