Bug 1880805 - Suppress Slice deprecation. r=android-reviewers,gl

Differential Revision: https://phabricator.services.mozilla.com/D217434

mobile/android/android-components/components/feature/autofill/src/main/java/mozilla/components/feature/autofill/response/dataset/LoginDatasetBuilder.kt

@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+@file:Suppress("DEPRECATION")
+
 package mozilla.components.feature.autofill.response.dataset
 
 import android.annotation.SuppressLint