Update copyright year in index.ts (#1076)

A small change to ensure that the required processes are kicked off to build changes from Commit 504f7f3.

Author: willum070

samples/js-api-loader-map/index.ts

@@ -1,6 +1,6 @@
 /**
  * @license
- * Copyright 2025 Google LLC. All Rights Reserved.
+ * Copyright 2026 Google LLC. All Rights Reserved.
  * SPDX-License-Identifier: Apache-2.0
  */