serverless-offline-sqs has undefined reference to this.region

[zlalvani]

In packages/serverless-offline-sqs/src/sqs.js, there is an undefined reference to this.region that causes the awsRegion parameter to not be passed to lambda invocations.

I've made a PR to fix the issue here: #166

[jlopezscala]

Facing the same issue when using AWS Powertools

Messages put into the SQS do not have the awsRegion field because of this causing a ValidationError