[csharp] ApiClient.mustache: Apply ConfigureAwait(false) consistently

Author: billybooth

modules/openapi-generator/src/main/resources/csharp/ApiClient.mustache

@@ -493,7 +493,7 @@ namespace {{packageName}}.Client
             {
                 InterceptRequest(request);
 
-                RestResponse<T> response = await getResponse(client);
+                RestResponse<T> response = await getResponse(client).ConfigureAwait(false);
 
                 // if the response type is oneOf/anyOf, call FromJSON to deserialize the data
                 if (typeof(AbstractOpenAPISchema).IsAssignableFrom(typeof(T)))
@@ -562,7 +562,7 @@ namespace {{packageName}}.Client
         {
             if (policyResult.Outcome == OutcomeType.Successful) 
             {
-                return await client.Deserialize<T>(policyResult.Result, cancellationToken);
+                return await client.Deserialize<T>(policyResult.Result, cancellationToken).ConfigureAwait(false);
             }
             else
             {
@@ -621,7 +621,7 @@ namespace {{packageName}}.Client
                 {
                     var policy = RetryConfiguration.AsyncRetryPolicy;
                     var policyResult = await policy.ExecuteAndCaptureAsync((ct) => client.ExecuteAsync(request, ct), cancellationToken).ConfigureAwait(false);
-                    return await DeserializeRestResponseFromPolicyAsync<T>(client, request, policyResult, cancellationToken);
+                    return await DeserializeRestResponseFromPolicyAsync<T>(client, request, policyResult, cancellationToken).ConfigureAwait(false);
                 }
                 else
                 {