Update dependency fluxcd/image-automation-controller to v0.21.0

This MR contains the following updates:

Package	Type	Update	Change
fluxcd/image-automation-controller	ironbank-github	minor	v0.20.0 -> v0.21.0

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Release Notes

fluxcd/image-automation-controller

v0.21.0

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v0.20.1

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CHANGELOG

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Configuration

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