fix dependency on aws logs

[drealecs]

Fix the wrong dependency on aws-java-sdk-iam instead of aws-java-sdk-logs
Looks like the logs module was first copied from iam and later some partial fixes were applied: efd40a3
Right now, installing jenkins plugin "Amazon Web Services SDK :: Logs" does not provide classes in aws-java-sdk-logs like com.amazonaws.services.logs.AWSLogsClientBuilder.

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