chore: fix year in license headers (#8345)

Author: tomivirkki

packages/date-picker/src/vaadin-lit-month-calendar.js

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright (c) 2016 - 2022 Vaadin Ltd.
+ * Copyright (c) 2016 - 2024 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 import { html, LitElement } from 'lit';

packages/horizontal-layout/src/vaadin-lit-horizontal-layout.d.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright (c) 2017 - 2023 Vaadin Ltd.
+ * Copyright (c) 2017 - 2024 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 export * from './vaadin-horizontal-layout.js';

packages/icon/src/vaadin-lit-icon.d.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright (c) 2017 - 2023 Vaadin Ltd.
+ * Copyright (c) 2017 - 2024 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 export * from './vaadin-icon.js';

packages/icon/src/vaadin-lit-iconset.d.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright (c) 2017 - 2023 Vaadin Ltd.
+ * Copyright (c) 2017 - 2024 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 export * from './vaadin-iconset.js';

packages/vertical-layout/src/vaadin-lit-vertical-layout.d.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright (c) 2017 - 2023 Vaadin Ltd.
+ * Copyright (c) 2017 - 2024 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
 export * from './vaadin-vertical-layout.js';