### 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
switch (variable->property) {
					case GDScriptParser::VariableNode::PROP_NONE:
						break; 
					case GDScriptParser::VariableNode::PROP_SETGET:
						if (variable->setter_pointer != nullptr) {
							minfo.setter = variable->setter_pointer->name;
						}
						if (variable->getter_pointer != nullptr) {
							minfo.getter = variable->getter_pointer->name;
						}
						break;
					case GDScriptParser::VariableNode::PROP_INLINE:
						if (variable->setter != nullptr) {
							minfo.setter = "@" + variable->identifier->name + "_setter";
						}
						if (variable->getter != nullptr) {
							minfo.getter = "@" + variable->identifier->name + "_getter";
						}
						break;
				}
				minfo.data_type = _gdtype_from_datatype(variable->get_datatype(), p_script);
				PropertyInfo prop_info = minfo.data_type;
				prop_info.name = name;
				PropertyInfo export_info = variable->export_info;
				if (variable->exported) {
					if (!minfo.data_type.has_type) {
						prop_info.type = export_info.type;
						prop_info.class_name = export_info.class_name;
					}
					prop_info.hint = export_info.hint;