Update dependency amazon/aws-cli to v2.7.20

This MR contains the following updates:

Package	Type	Update	Change
amazon/aws-cli	ironbank-docker	patch	2.7.19 -> 2.7.20
amazon/aws-cli		patch	2.7.19 -> 2.7.20
amazon/aws-cli	stage	patch	2.7.19 -> 2.7.20

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