### 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 (!field->is_static) {
			continue;
		}
		GDScriptDataType field_type = _gdtype_from_datatype(field->get_datatype(), codegen.script);
		if (field_type.has_type) {
			codegen.generator->write_newline(field->start_line);
			if (field_type.has_container_element_type()) {
				GDScriptCodeGenerator::Address temp = codegen.add_temporary(field_type);
				codegen.generator->write_construct_typed_array(temp, field_type.get_container_element_type(), Vector<GDScriptCodeGenerator::Address>());
				codegen.generator->write_set_static_variable(temp, class_addr, p_script->static_variables_indices[field->identifier->name].index);
				codegen.generator->pop_temporary();
			} else if (field_type.kind == GDScriptDataType::BUILTIN) {
				GDScriptCodeGenerator::Address temp = codegen.add_temporary(field_type);
				codegen.generator->write_construct(temp, field_type.builtin_type, Vector<GDScriptCodeGenerator::Address>());
				codegen.generator->write_set_static_variable(temp, class_addr, p_script->static_variables_indices[field->identifier->name].index);
				codegen.generator->pop_temporary();
			}
			
		}
	}
	for (int i = 0; i < p_class->members.size(); i++) {
		
		if (p_class->members[i].type != GDScriptParser::ClassNode::Member::VARIABLE) {
			continue;
		}
		const GDScriptParser::VariableNode *field = p_class->members[i].variable;
		if (!field->is_static) {
			continue;
		}
		if (field->initializer) {