### 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
new_annotation.info.default_arguments = p_default_arguments;
	if (p_is_vararg) {
		new_annotation.info.flags |= METHOD_FLAG_VARARG;
	}
	new_annotation.apply = p_apply;
	new_annotation.target_kind = p_target_kinds;
	valid_annotations[p_info.name] = new_annotation;
	return true;
}
GDScriptParser::SuiteNode *GDScriptParser::parse_suite(const String &p_context, SuiteNode *p_suite, bool p_for_lambda) {
	SuiteNode *suite = p_suite != nullptr ? p_suite : alloc_node<SuiteNode>();
	suite->parent_block = current_suite;
	suite->parent_function = current_function;
	current_suite = suite;
	bool multiline = false;
	if (match(GDScriptTokenizer::Token::NEWLINE)) {
		multiline = true;
	}
	if (multiline) {
		if (!consume(GDScriptTokenizer::Token::INDENT, vformat(R"(Expected indented block after %s.)", p_context))) {
			current_suite = suite->parent_block;
			complete_extents(suite);
			return suite;
		}
	}
	reset_extents(suite, current);
	int error_count = 0;
	do {
		if (is_at_end() || (!multiline && previous.type == GDScriptTokenizer::Token::SEMICOLON && check(GDScriptTokenizer::Token::NEWLINE))) {
			break;