[v1.15.4] Musl support (#475)

Co-authored-by: GitHub Actions <aws-sdk-common-runtime@amazon.com>

Author: bretambrose

README.md

@@ -102,4 +102,4 @@ We need your help in making this SDK great. Please participate in the community
 
 This library is licensed under the [Apache 2.0 License](./documents/LICENSE).
 
-Latest released version: v1.15.3
+Latest released version: v1.15.4