### 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
return nullptr;
			} else {
				if (expression->type == GDScriptParser::Node::LITERAL) {
					pattern->pattern_type = PatternNode::PT_LITERAL;
				} else {
					pattern->pattern_type = PatternNode::PT_EXPRESSION;
				}
				pattern->expression = expression;
			}
			break;
		}
	}
	complete_extents(pattern);
	return pattern;
}
bool GDScriptParser::PatternNode::has_bind(const StringName &p_name) {
	return binds.has(p_name);
}
GDScriptParser::IdentifierNode *GDScriptParser::PatternNode::get_bind(const StringName &p_name) {
	return binds[p_name];
}
GDScriptParser::WhileNode *GDScriptParser::parse_while() {
	WhileNode *n_while = alloc_node<WhileNode>();
	n_while->condition = parse_expression(false);
	if (n_while->condition == nullptr) {
		push_error(R"(Expected conditional expression after "while".)");
	}
	consume(GDScriptTokenizer::Token::COLON, R"(Expected ":" after "while" condition.)");
	
	bool could_break = can_break;