Change Lambda runtime from Python 3.8/3.9 to Python 3.11

[nakajiak]

• https://aws.amazon.com/about-aws/whats-new/2023/07/aws-lambda-python-3-11/

• https://aws.amazon.com/about-aws/whats-new/2023/10/aws-lambda-python-3-11-aws-govcloud-regions/

• https://www.amazonaws.cn/en/new/2023/amazon-lambda-adds-support-for-python-3-11-in-amazon-web-services-china-regions/

• https://docs.python.org/3/whatsnew/3.11.html

  Python 3.11 is between 10-60% faster than Python 3.10. On average, we measured a 1.25x speedup on the standard benchmark suite.