### 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 if (sub_pattern->pattern_type == PatternNode::PT_REST) {
						pattern->rest_used = true;
					}
					pattern->array.push_back(sub_pattern);
				} while (match(GDScriptTokenizer::Token::COMMA));
			}
			consume(GDScriptTokenizer::Token::BRACKET_CLOSE, R"(Expected "]" to close the array pattern.)");
			break;
		}
		case GDScriptTokenizer::Token::BRACE_OPEN: {
			
			advance();
			pattern->pattern_type = PatternNode::PT_DICTIONARY;
			do {
				if (check(GDScriptTokenizer::Token::BRACE_CLOSE) || is_at_end()) {
					break;
				}
				if (match(GDScriptTokenizer::Token::PERIOD_PERIOD)) {
					
					if (pattern->rest_used) {
						push_error(R"(The ".." pattern must be the last element in the pattern dictionary.)");
					} else {
						PatternNode *sub_pattern = alloc_node<PatternNode>();
						complete_extents(sub_pattern);
						sub_pattern->pattern_type = PatternNode::PT_REST;
						pattern->dictionary.push_back({ nullptr, sub_pattern });
						pattern->rest_used = true;
					}
				} else {
					ExpressionNode *key = parse_expression(false);