### 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 (src.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
					gen->pop_temporary();
				}
			} else {
				result = _parse_expression(codegen, r_error, cn->operand);
			}
			return result;
		} break;
		case GDScriptParser::Node::CALL: {
			const GDScriptParser::CallNode *call = static_cast<const GDScriptParser::CallNode *>(p_expression);
			bool is_awaited = p_expression == awaited_node;
			GDScriptDataType type = _gdtype_from_datatype(call->get_datatype(), codegen.script);
			GDScriptCodeGenerator::Address result;
			if (p_root) {
				result = GDScriptCodeGenerator::Address(GDScriptCodeGenerator::Address::NIL);
			} else {
				result = codegen.add_temporary(type);
			}
			Vector<GDScriptCodeGenerator::Address> arguments;
			for (int i = 0; i < call->arguments.size(); i++) {
				GDScriptCodeGenerator::Address arg = _parse_expression(codegen, r_error, call->arguments[i]);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}
				arguments.push_back(arg);
			}
			if (!call->is_super && call->callee->type == GDScriptParser::Node::IDENTIFIER && GDScriptParser::get_builtin_type(call->function_name) != Variant::VARIANT_MAX) {
				
				Variant::Type vtype = GDScriptParser::get_builtin_type(static_cast<GDScriptParser::IdentifierNode *>(call->callee)->name);
				gen->write_construct(result, vtype, arguments);