Update amazon/aws-cli Docker tag to v2.6.1

This MR contains the following updates:

Package	Type	Update	Change
amazon/aws-cli	ironbank-docker	minor	2.5.8 -> 2.6.1
amazon/aws-cli		minor	2.5.8 -> 2.6.1
amazon/aws-cli	stage	minor	2.5.8 -> 2.6.1

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