### 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->write_binary_operator(equality_addr, Variant::OP_EQUAL, p_value_addr, literal_addr);
			codegen.generator->write_and_right_operand(equality_addr);
			
			codegen.generator->write_end_and(type_equality_addr);
			codegen.generator->pop_temporary(); 
			if (literal_addr.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
				codegen.generator->pop_temporary();
			}
			
			if (p_is_nested) {
				
				codegen.generator->write_and_right_operand(type_equality_addr);
				codegen.generator->write_end_and(p_previous_test);
			} else if (!p_is_first) {
				
				codegen.generator->write_or_right_operand(type_equality_addr);
				codegen.generator->write_end_or(p_previous_test);
			} else {
				
				codegen.generator->write_assign(p_previous_test, type_equality_addr);
			}
			codegen.generator->pop_temporary(); 
			return p_previous_test;
		} break;
		case GDScriptParser::PatternNode::PT_EXPRESSION: {
			if (p_is_nested) {
				codegen.generator->write_and_left_operand(p_previous_test);
			} else if (!p_is_first) {
				codegen.generator->write_or_left_operand(p_previous_test);
			}