### 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
}
				r_state = DOC_LINE_NORMAL;
				buffer_start = from;
			} break;
		}
	}
	result += line.substr(buffer_start);
	if (r_state == DOC_LINE_NORMAL) {
		result = result.strip_edges(false, true);
	}
	return line_join + result;
}
bool GDScriptParser::has_comment(int p_line, bool p_must_be_doc) {
	bool has_comment = tokenizer.get_comments().has(p_line);
	
	
	if (!p_must_be_doc || !has_comment) {
		return has_comment;
	}
	return tokenizer.get_comments()[p_line].comment.begins_with("##");
}
String GDScriptParser::get_doc_comment(int p_line, bool p_single_line) {
	const HashMap<int, GDScriptTokenizer::CommentData> &comments = tokenizer.get_comments();
	ERR_FAIL_COND_V(!comments.has(p_line), String());
	if (p_single_line) {
		if (comments[p_line].comment.begins_with("##")) {
			return comments[p_line].comment.trim_prefix("##").strip_edges();
		}
		return "";
	}