Use AWS auth dependency for LocalStack

[AdamJKing]

I believe the error addressed in https://github.com/testcontainers/testcontainers-scala/pull/136 and https://github.com/testcontainers/testcontainers-scala/pull/216 can actually be fixed for all client types if you use the auth dependency directly rather than individual client libraries.

I've tested this locally on a project where I was getting java.lang.NoClassDefFoundError: com/amazonaws/auth/AWSCredentials when using secrets-manager and switching to this dependency fixed it.