### 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
NONE = 0,
			SCRIPT = 1 << 0,
			CLASS = 1 << 1,
			VARIABLE = 1 << 2,
			CONSTANT = 1 << 3,
			SIGNAL = 1 << 4,
			FUNCTION = 1 << 5,
			STATEMENT = 1 << 6,
			STANDALONE = 1 << 7,
			CLASS_LEVEL = CLASS | VARIABLE | FUNCTION,
		};
		uint32_t target_kind = 0; 
		AnnotationAction apply = nullptr;
		MethodInfo info;
	};
	HashMap<StringName, AnnotationInfo> valid_annotations;
	List<AnnotationNode *> annotation_stack;
	typedef ExpressionNode *(GDScriptParser::*ParseFunction)(ExpressionNode *p_previous_operand, bool p_can_assign);
	
	enum Precedence {