### 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
if (E->get().start_line > warning.start_line) {
			break;
		}
		before = E;
	}
	if (before) {
		warnings.insert_after(before, warning);
	} else {
		warnings.push_front(warning);
	}
}
#endif
void GDScriptParser::make_completion_context(CompletionType p_type, Node *p_node, int p_argument, bool p_force) {
	if (!for_completion || (!p_force && completion_context.type != COMPLETION_NONE)) {
		return;
	}
	if (previous.cursor_place != GDScriptTokenizer::CURSOR_MIDDLE && previous.cursor_place != GDScriptTokenizer::CURSOR_END && current.cursor_place == GDScriptTokenizer::CURSOR_NONE) {
		return;
	}
	CompletionContext context;
	context.type = p_type;
	context.current_class = current_class;
	context.current_function = current_function;
	context.current_suite = current_suite;
	context.current_line = tokenizer.get_cursor_line();
	context.current_argument = p_argument;
	context.node = p_node;
	completion_context = context;
}
void GDScriptParser::make_completion_context(CompletionType p_type, Variant::Type p_builtin_type, bool p_force) {