### 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
codegen.generator->pop_temporary();
			
			GDScriptCodeGenerator::Address element_addr = codegen.add_temporary();
			GDScriptCodeGenerator::Address element_type_addr = codegen.add_temporary();
			
			for (int i = 0; i < p_pattern->dictionary.size(); i++) {
				const GDScriptParser::PatternNode::Pair &element = p_pattern->dictionary[i];
				if (element.value_pattern && element.value_pattern->pattern_type == GDScriptParser::PatternNode::PT_REST) {
					
					break;
				}
				
				codegen.generator->write_and_left_operand(result_addr);
				
				GDScriptCodeGenerator::Address pattern_key_addr = _parse_expression(codegen, r_error, element.key);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}
				
				func_args.clear();
				func_args.push_back(pattern_key_addr);
				codegen.generator->write_call(result_addr, p_value_addr, "has", func_args);
				if (element.value_pattern != nullptr) {
					
					codegen.generator->write_and_left_operand(result_addr);
					
					codegen.generator->write_get(element_addr, pattern_key_addr, p_value_addr);
					
					func_args.clear();
					func_args.push_back(element_addr);