### 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
while (scr) {
											if (scr->static_variables_indices.has(var_name)) {
												is_member_property = true;
												is_static = true;
												const GDScript::MemberInfo &minfo = scr->static_variables_indices[var_name];
												member_property_setter_function = minfo.setter;
												member_property_has_setter = member_property_setter_function != StringName();
												member_property_is_in_setter = member_property_has_setter && member_property_setter_function == codegen.function_name;
												static_var_class = codegen.add_constant(scr);
												static_var_index = minfo.index;
												static_var_data_type = minfo.data_type;
												break;
											}
											scr = scr->_base;
										}
									}
								}
							}
							break;
						}
						n = static_cast<const GDScriptParser::SubscriptNode *>(n->base);
					}
				}
				
				
				GDScriptCodeGenerator::Address base = _parse_expression(codegen, r_error, chain.back()->get()->base);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}
				GDScriptCodeGenerator::Address prev_base = base;