### 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
SuiteNode *else_block = alloc_node<SuiteNode>();
		else_block->parent_function = current_function;
		else_block->parent_block = current_suite;
		SuiteNode *previous_suite = current_suite;
		current_suite = else_block;
		IfNode *elif = parse_if("elif");
		else_block->statements.push_back(elif);
		complete_extents(else_block);
		n_if->false_block = else_block;
		current_suite = previous_suite;
	} else if (match(GDScriptTokenizer::Token::ELSE)) {
		consume(GDScriptTokenizer::Token::COLON, R"(Expected ":" after "else".)");
		n_if->false_block = parse_suite(R"("else" block)");
	}
	complete_extents(n_if);
	if (n_if->false_block != nullptr && n_if->false_block->has_return && n_if->true_block->has_return) {
		current_suite->has_return = true;
	}
	if (n_if->false_block != nullptr && n_if->false_block->has_continue) {
		current_suite->has_continue = true;
	}
	return n_if;
}
GDScriptParser::MatchNode *GDScriptParser::parse_match() {
	MatchNode *match = alloc_node<MatchNode>();
	match->test = parse_expression(false);
	if (match->test == nullptr) {
		push_error(R"(Expected expression to test after "match".)");
	}
	consume(GDScriptTokenizer::Token::COLON, R"(Expected ":" after "match" expression.)");