### 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
_FORCE_INLINE_ bool is_resolving() const { return kind == RESOLVING; }
		_FORCE_INLINE_ bool has_no_type() const { return type_source == UNDETECTED; }
		_FORCE_INLINE_ bool is_variant() const { return kind == VARIANT || kind == RESOLVING || kind == UNRESOLVED; }
		_FORCE_INLINE_ bool is_hard_type() const { return type_source > INFERRED; }
		String to_string() const;
		_FORCE_INLINE_ void set_container_element_type(const DataType &p_type) {
			container_element_type = memnew(DataType(p_type));
		}
		_FORCE_INLINE_ DataType get_container_element_type() const {
			ERR_FAIL_COND_V(container_element_type == nullptr, DataType());
			return *container_element_type;
		}
		_FORCE_INLINE_ bool has_container_element_type() const {
			return container_element_type != nullptr;
		}
		_FORCE_INLINE_ void unset_container_element_type() {
			if (container_element_type) {
				memdelete(container_element_type);
			};
			container_element_type = nullptr;
		}
		bool is_typed_container_type() const;
		GDScriptParser::DataType get_typed_container_type() const;
		bool operator==(const DataType &p_other) const {