lambda: Switch to new AWS runtime

AWS just dropped support of `go1.x` runtime.

We need to switch it to `provided.al2` runtime.

Seems not difficult to do this.

Doc: https://aws.amazon.com/cn/blogs/compute/migrating-aws-lambda-functions-from-the-go1-x-runtime-to-the-custom-runtime-on-amazon-linux-2/?nc1=h_ls

With AWS SAM deployment in mind.