chore: Add required @license tag to any_aliases.ts (#6899)

Missing licence tag causes presubmit failure when updating
Blockly in third_party.

core/any_aliases.ts

@@ -1,2 +1,8 @@
+/**
+ * @license
+ * Copyright 2023 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 // eslint-disable-next-line
 type AnyDuringMigration = any;