Bring service configuration sample up-to-date (#6833)

Finished modernizing

Author: shepazon

swift/example_code/swift-sdk/config/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.8
+// swift-tools-version: 5.6
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
@@ -16,7 +16,7 @@ let package = Package(
         // Dependencies declare other packages that this package depends on.
         .package(
             url: "https://github.com/awslabs/aws-sdk-swift",
-            from: "0.36.0"
+            from: "0.75.0"
         ),
     ],
     targets: [

swift/example_code/swift-sdk/config/Sources/ConfigExample.swift

@@ -5,16 +5,18 @@
 // SDK for Swift. The same principle applies to all services.
 
 import Foundation
-import ClientRuntime
+import AWSClientRuntime
 import AWSS3
+import SmithyRetries
+import SmithyRetriesAPI
 
 @main
 struct ConfigExample {
     static func main() async {
         // snippet-start:[config.swift.use-custom-configuration]
         // Create an Amazon S3 client configuration object that specifies the
-        // region as "us-east-1", the adaptive retry mode, and the maximum
-        // number of retries as 5.
+        // region as "us-east-1", an exponential backoff strategy, the
+        // adaptive retry mode, and the maximum number of retries as 5.
 
         let config: S3Client.S3ClientConfiguration
 
@@ -23,8 +25,9 @@ struct ConfigExample {
             config = try await S3Client.S3ClientConfiguration(
                 region: "us-east-1", 
                 retryStrategyOptions: RetryStrategyOptions(
+                    backoffStrategy: SmithyRetries.ExponentialBackoffStrategy(),
                     maxRetriesBase: 5,
-                    rateLimitingMode: .adaptive
+                    rateLimitingMode: RetryStrategyOptions.RateLimitingMode.adaptive
                 )
             )
             // snippet-end:[config.swift.create-configuration]