### 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
return parse_precedence(PREC_ASSIGNMENT, p_can_assign, p_stop_on_assign);
}
GDScriptParser::IdentifierNode *GDScriptParser::parse_identifier() {
	IdentifierNode *identifier = static_cast<IdentifierNode *>(parse_identifier(nullptr, false));
#ifdef DEBUG_ENABLED
	
	if (identifier && TS->has_feature(TextServer::FEATURE_UNICODE_SECURITY) && TS->spoof_check(identifier->name.operator String())) {
		push_warning(identifier, GDScriptWarning::CONFUSABLE_IDENTIFIER, identifier->name.operator String());
	}
#endif
	return identifier;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_identifier(ExpressionNode *p_previous_operand, bool p_can_assign) {
	if (!previous.is_identifier()) {
		ERR_FAIL_V_MSG(nullptr, "Parser bug: parsing identifier node without identifier token.");
	}
	IdentifierNode *identifier = alloc_node<IdentifierNode>();
	complete_extents(identifier);
	identifier->name = previous.get_identifier();
	if (current_suite != nullptr && current_suite->has_local(identifier->name)) {
		const SuiteNode::Local &declaration = current_suite->get_local(identifier->name);
		identifier->source_function = declaration.source_function;
		switch (declaration.type) {
			case SuiteNode::Local::CONSTANT:
				identifier->source = IdentifierNode::LOCAL_CONSTANT;