Remove dependencies on AWS sdk v1

[sebastiannberg]

In the closed issue #939

it looks like AWS SDK v2 has been supported for a long time now.
Is it possible to fully remove AWS SDK v1 as a dependency?

[havetisyan]

All the server components are already using AWS SDK v2. The only dependency still using the AWS SDK v1 is zts java client since it provides an aws credentials provider and we still want to support both v1 and v2 clients. Currently there are no plans to remove that dependency change since that would be a breaking change for our users.

Whenever the major release 1.13.x happens for athenz, we'll most likely remove support for v1 aws credentials provider. That's currently planned sometime in Q1 or Q2 of next year when we move to jetty 12.1.x release.