chore(license): Add THIRD-PARTY-LICENSES (#641)

pyproject.toml

@@ -3,7 +3,7 @@ name = "aws_lambda_powertools"
 version = "1.20.1"
 description = "A suite of utilities for AWS Lambda functions to ease adopting best practices such as tracing, structured logging, custom metrics, batching, idempotency, feature flags, and more."
 authors = ["Amazon Web Services"]
-include = ["aws_lambda_powertools/py.typed"]
+include = ["aws_lambda_powertools/py.typed", "THIRD-PARTY-LICENSES"]
 classifiers=[
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",