### 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
constants.clear();
	HashMap<StringName, GDScriptFunction *> member_functions;
	for (const KeyValue<StringName, GDScriptFunction *> &E : p_script->member_functions) {
		member_functions.insert(E.key, E.value);
	}
	p_script->member_functions.clear();
	for (const KeyValue<StringName, GDScriptFunction *> &E : member_functions) {
		memdelete(E.value);
	}
	member_functions.clear();
	p_script->static_variables.clear();
	if (p_script->implicit_initializer) {
		memdelete(p_script->implicit_initializer);
	}
	if (p_script->implicit_ready) {
		memdelete(p_script->implicit_ready);
	}
	if (p_script->static_initializer) {
		memdelete(p_script->static_initializer);
	}
	p_script->member_functions.clear();
	p_script->member_indices.clear();
	p_script->member_info.clear();
	p_script->static_variables_indices.clear();
	p_script->static_variables.clear();
	p_script->_signals.clear();
	p_script->initializer = nullptr;
	p_script->implicit_initializer = nullptr;
	p_script->implicit_ready = nullptr;
	p_script->static_initializer = nullptr;