### 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 AnnotationNode *E : p_variable->annotations) {
		print_annotation(E);
	}
	push_text("Variable ");
	print_identifier(p_variable->identifier);
	push_text(" : ");
	if (p_variable->datatype_specifier != nullptr) {
		print_type(p_variable->datatype_specifier);
	} else if (p_variable->infer_datatype) {
		push_text("<inferred type>");
	} else {
		push_text("Variant");
	}
	increase_indent();
	push_line();
	push_text("= ");
	if (p_variable->initializer == nullptr) {
		push_text("<default value>");
	} else {
		print_expression(p_variable->initializer);
	}
	push_line();
	if (p_variable->property != VariableNode::PROP_NONE) {
		if (p_variable->getter != nullptr) {
			push_text("Get");