Kotlin Removed env variable provider (#7223)

removed env variable provider

Author: scmacdon

kotlin/services/apigateway/src/test/kotlin/APIGatewayTest.kt

@@ -1,7 +1,6 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-import aws.sdk.kotlin.runtime.auth.credentials.EnvironmentCredentialsProvider
 import aws.sdk.kotlin.services.apigateway.ApiGatewayClient
 import aws.sdk.kotlin.services.secretsmanager.SecretsManagerClient
 import aws.sdk.kotlin.services.secretsmanager.model.GetSecretValueRequest
@@ -96,7 +95,6 @@ class APIGatewayTest {
         }
         SecretsManagerClient {
             region = "us-east-1"
-            credentialsProvider = EnvironmentCredentialsProvider()
         }.use { secretClient ->
             val valueResponse = secretClient.getSecretValue(valueRequest)
             return valueResponse.secretString.toString()