### 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
if (locals_indices.has(p_name)) {
		return true;
	}
	if (parent_block != nullptr) {
		return parent_block->has_local(p_name);
	}
	return false;
}
const GDScriptParser::SuiteNode::Local &GDScriptParser::SuiteNode::get_local(const StringName &p_name) const {
	if (locals_indices.has(p_name)) {
		return locals[locals_indices[p_name]];
	}
	if (parent_block != nullptr) {
		return parent_block->get_local(p_name);
	}
	return empty;
}
bool GDScriptParser::AnnotationNode::apply(GDScriptParser *p_this, Node *p_target) {
	if (is_applied) {
		return true;
	}
	is_applied = true;
	return (p_this->*(p_this->valid_annotations[name].apply))(this, p_target);
}
bool GDScriptParser::AnnotationNode::applies_to(uint32_t p_target_kinds) const {
	return (info->target_kind & p_target_kinds) > 0;
}
bool GDScriptParser::validate_annotation_arguments(AnnotationNode *p_annotation) {