### 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 check(GDScriptTokenizer::Token::NEWLINE) || check(GDScriptTokenizer::Token::SEMICOLON) || check(GDScriptTokenizer::Token::TK_EOF);
}
bool GDScriptParser::is_statement_end() const {
	return lambda_ended || in_lambda || is_statement_end_token();
}
void GDScriptParser::end_statement(const String &p_context) {
	bool found = false;
	while (is_statement_end() && !is_at_end()) {
		
		if (is_statement_end_token()) {
			
			advance();
		} else if (lambda_ended) {
			lambda_ended = false; 
			found = true;
			break;
		} else {
			if (!found) {
				lambda_ended = true; 
				found = true;
			}
			break;
		}
		found = true;
	}
	if (!found && !is_at_end()) {
		push_error(vformat(R"(Expected end of statement after %s, found "%s" instead.)", p_context, current.get_name()));
	}
}
void GDScriptParser::parse_program() {