remove unused import from package-mixins (#1325)

Author: krunalsshah

package-mixins.js

@@ -1,4 +1,3 @@
-import { AcquisitionManager as Sdk } from "code-push/script/acquisition-sdk";
 import { NativeEventEmitter } from "react-native";
 import RestartManager from "./RestartManager";
 import log from "./logging";