Update AWS SDK models (#575)

aws/sdk/aws-models/accessanalyzer.json

aws/sdk/aws-models/amp.json

aws/sdk/aws-models/amplifybackend.json

aws/sdk/aws-models/appmesh.json

aws/sdk/aws-models/autoscaling.json

aws/sdk/aws-models/braket.json

aws/sdk/aws-models/chime.json

aws/sdk/aws-models/cloud9.json

aws/sdk/aws-models/cloudformation.json

aws/sdk/aws-models/cloudfront.json

aws/sdk/aws-models/cloudsearch.json

aws/sdk/aws-models/codebuild.json

aws/sdk/aws-models/codeguru-reviewer.json

aws/sdk/aws-models/codeguruprofiler.json

aws/sdk/aws-models/connect.json

aws/sdk/aws-models/databrew.json

aws/sdk/aws-models/dax.json

aws/sdk/aws-models/docdb.json

aws/sdk/aws-models/ec2.json

aws/sdk/aws-models/elasticache.json