Use year 2023 in the License headers (#13193)

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/HEADER-APACHE2

 // This file is part of Substrate.
 
-// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// Copyright (C) 2023 Parity Technologies (UK) Ltd.
 // SPDX-License-Identifier: Apache-2.0
 
 // Licensed under the Apache License, Version 2.0 (the "License");

substrate/HEADER-GPL3

 // This file is part of Substrate.
 
-// Copyright (C) 2022 Parity Technologies (UK) Ltd.
+// Copyright (C) 2023 Parity Technologies (UK) Ltd.
 // SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
 
 // This program is free software: you can redistribute it and/or modify