chore: enable transcribe concurrency tests on linux and windows

IntegrationTests/Services/AWSTranscribeStreamingIntegrationTests/TranscribeStreamingTests.swift

@@ -23,16 +23,12 @@ final class TranscribeStreamingTests: XCTestCase {
     // such as:
     // code: 2058, message: "The connection has closed or is closing."
     // code: 2087, message: "Stream acquisition failed because stream manager failed to acquire a connection"
-    //
-    // Disable this test on the CRT client until these failures can be investigated & corrected.
-    #if !os(Linux) && !os(Windows)
     func test_25xConcurrent_streamTranscription() async throws {
         // By default the TranscribeStreaming service allows 25 concurrent transcriptions.
         // More than that (which can happen when multiple test runs are being performed) will result
         // in throttling / resource exceeded errors, which may be retried (see retry logic below.)
         try await repeatConcurrently(count: 25, test: attempt)
     }
-    #endif
 
     // MARK: - Private / implementation methods
 

Sources/Core/AWSClientRuntime/Sources/AWSClientRuntime/Retry/AWSRetryErrorInfoProvider.swift

@@ -45,6 +45,7 @@ public enum AWSRetryErrorInfoProvider: RetryErrorInfoProvider {
     private static let transientCRTErrorCodes: [Int32] = [
         2058, // httpConnectionClosed
         2070, // httpServerClosed
+        2087, // AWS_ERROR_HTTP_STREAM_MANAGER_CONNECTION_ACQUIRE_FAILURE
     ]
 
     // HTTP status codes that the Retry Behavior 2.0 specification say should be treated as transient errors.