Add latest boto3 and botocore layers

Latest versions of boto3/botocore available with Python runtimes are too old.

For example, built-in boto3 version does not support ExecutionParameters for Athena's StartQueryExecution which is a security risk: a developer might pass the parameters via string substitution which will result in an SQL injection.

The idea is to maintain boto3/botocore layers with the latest available versions to easily plug them in and use.