Fix a bug in SQL Data Classification cmdlets (Azure#12088)

* Update DataClassificationEndpointsCommunicator.cs

* Update ChangeLog.md

Author: bashahee

src/Sql/Sql/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed a bug in Data Classification cmdlets.
 
 ## Version 2.7.0
 * Added UsePrivateLinkConnection to `New-AzSqlSyncGroup`, `Update-AzSqlSyncGroup`, `New-AzSqlSyncMember` and `Update-AzSqlSyncMember`

src/Sql/Sql/DataClassification/Services/DataClassificationEndpointsCommunicator.cs

@@ -225,7 +225,7 @@ private void PatchOperations(string resourceGroupName, string serverName, string
             };
 
             SqlManagementClient client = GetCurrentSqlManagementClient();
-            client.Credentials.ProcessHttpRequestAsync(httpRequest, CancellationToken.None).ConfigureAwait(false);
+            client.Credentials.ProcessHttpRequestAsync(httpRequest, CancellationToken.None).ConfigureAwait(false).GetAwaiter().GetResult();
             HttpResponseMessage response = client.HttpClient.SendAsync(httpRequest, CancellationToken.None).Result;
             response.EnsureSuccessStatusCode();
         }