### 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
if (p_need_indent) {
		if (!consume(GDScriptTokenizer::Token::INDENT, R"(Expected indented block for property after ":".)")) {
			complete_extents(p_variable);
			return nullptr;
		}
	}
	VariableNode *property = p_variable;
	make_completion_context(COMPLETION_PROPERTY_DECLARATION, property);
	if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected "get" or "set" for property declaration.)")) {
		complete_extents(p_variable);
		return nullptr;
	}
	IdentifierNode *function = parse_identifier();
	if (check(GDScriptTokenizer::Token::EQUAL)) {
		p_variable->property = VariableNode::PROP_SETGET;
	} else {
		p_variable->property = VariableNode::PROP_INLINE;
		if (!p_need_indent) {
			push_error("Property with inline code must go to an indented block.");
		}
	}
	bool getter_used = false;
	bool setter_used = false;