### 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
} else {
			member->doc_description = get_doc_comment(doc_comment_line);
		}
	}
#endif 
	if (member->identifier != nullptr) {
		if (!((String)member->identifier->name).is_empty()) { 
#ifdef DEBUG_ENABLED
			List<MethodInfo> gdscript_funcs;
			GDScriptLanguage::get_singleton()->get_public_functions(&gdscript_funcs);
			for (MethodInfo &info : gdscript_funcs) {
				if (info.name == member->identifier->name) {
					push_warning(member->identifier, GDScriptWarning::SHADOWED_GLOBAL_IDENTIFIER, p_member_kind, member->identifier->name, "built-in function");
				}
			}
			if (Variant::has_utility_function(member->identifier->name)) {
				push_warning(member->identifier, GDScriptWarning::SHADOWED_GLOBAL_IDENTIFIER, p_member_kind, member->identifier->name, "built-in function");
			}
#endif
			if (current_class->members_indices.has(member->identifier->name)) {
				push_error(vformat(R"(%s "%s" has the same name as a previously declared %s.)", p_member_kind.capitalize(), member->identifier->name, current_class->get_member(member->identifier->name).get_type_name()), member->identifier);
			} else {
				current_class->add_member(member);
			}
		} else {
			current_class->add_member(member);
		}
	}
}
void GDScriptParser::parse_class_body(bool p_is_multiline) {