chore: update year

Author: mrholek

README.md

@@ -198,5 +198,5 @@ Thanks to all the backers and sponsors! Support this project by [becoming a back
 
 ## Copyright and license
 
-copyright 2022 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-bootstrap-admin-template/blob/main/LICENSE).
+copyright 2023 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-bootstrap-admin-template/blob/main/LICENSE).
 There is only one limitation you can't can’t re-distribute the CoreUI as stock. You can’t do this if you modify the CoreUI. In past we faced some problems with persons who tried to sell CoreUI based templates.