### 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
for (const KeyValue<StringName, IdentifierNode *> &E : branch->patterns[0]->binds) {
			SuiteNode::Local local(E.value, current_function);
			local.type = SuiteNode::Local::PATTERN_BIND;
			suite->add_local(local);
		}
	}
	branch->block = parse_suite("match pattern block", suite);
	complete_extents(branch);
	return branch;
}
GDScriptParser::PatternNode *GDScriptParser::parse_match_pattern(PatternNode *p_root_pattern) {
	PatternNode *pattern = alloc_node<PatternNode>();
	reset_extents(pattern, current);
	switch (current.type) {
		case GDScriptTokenizer::Token::VAR: {
			
			advance();
			if (!consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected bind name after "var".)")) {
				complete_extents(pattern);
				return nullptr;
			}
			pattern->pattern_type = PatternNode::PT_BIND;
			pattern->bind = parse_identifier();
			PatternNode *root_pattern = p_root_pattern == nullptr ? pattern : p_root_pattern;
			if (p_root_pattern != nullptr) {
				if (p_root_pattern->has_bind(pattern->bind->name)) {
					push_error(vformat(R"(Bind variable name "%s" was already used in this pattern.)", pattern->bind->name));
					complete_extents(pattern);
					return nullptr;
				}