### 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
#ifdef DEBUG_ENABLED
	bool has_error = false;
	for (const Variant &warning_name : p_annotation->resolved_arguments) {
		GDScriptWarning::Code warning = GDScriptWarning::get_code_from_name(String(warning_name).to_upper());
		if (warning == GDScriptWarning::WARNING_MAX) {
			push_error(vformat(R"(Invalid warning name: "%s".)", warning_name), p_annotation);
			has_error = true;
		} else {
			p_node->ignored_warnings.push_back(warning);
		}
	}
	return !has_error;
#else 
	
	return true;
#endif 
}
bool GDScriptParser::rpc_annotation(const AnnotationNode *p_annotation, Node *p_node) {