Add third-party attributions

Author: clareliguori

THIRD-PARTY

@@ -0,0 +1,231 @@
+** AWS SDK for JavaScript; version 2.562.0 -- https://github.com/aws/aws-sdk-js
+Copyright 2012-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+
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+* For AWS SDK for JavaScript see also this required NOTICE:
+    Copyright 2012-2018 Amazon.com, Inc. or its affiliates. All Rights
+    Reserved.
+
+------
+
+** GitHub Actions Toolkit; version 1.2.0 -- https://github.com/actions/toolkit
+Copyright 2019 GitHub
+
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