Maintenance: Address sonar lints

[scottgerring]

Summary

Now that we have sonar running, we have a lot of minor lints. It would be nice to address these.

Why is this needed?

Incrementally raise quality bar

Which area does this relate to?

No response

Solution

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (Java) Tenets
• Should this be considered in other Powertools for AWS Lambda (Java) languages? i.e. Python, TypeScript