remove unneeded dep

lib/azureServiceClient.ts

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
-import { HttpOperationResponse, OperationArguments, OperationSpec, RequestOptionsBase, RequestPrepareOptions, ServiceClient, ServiceClientCredentials, ServiceClientOptions, WebResource, getDefaultUserAgentValue as getDefaultUserAgentValueFromMsRest, TokenCredentials } from "@azure/ms-rest-js";
+import { HttpOperationResponse, OperationArguments, OperationSpec, RequestOptionsBase, RequestPrepareOptions, ServiceClient, ServiceClientCredentials, ServiceClientOptions, WebResource, getDefaultUserAgentValue as getDefaultUserAgentValueFromMsRest } from "@azure/ms-rest-js";
 import { TokenCredential } from "@azure/core-auth";
 import { createLROPollerFromInitialResponse, createLROPollerFromPollState, LROPoller } from "./lroPoller";
 import { LROPollState } from "./lroPollStrategy";