Update Ironbank to v1.21.1

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/istio/install-cni (source)	minor	1.20.4 -> 1.21.1
registry1.dso.mil/ironbank/opensource/istio/pilot (source)	minor	1.20.4 -> 1.21.1
registry1.dso.mil/ironbank/opensource/istio/proxyv2	minor	1.20.4 -> 1.21.1
registry1.dso.mil/ironbank/tetrate/istio/install-cni (source)	minor	1.20.4-tetratefips-v0 -> 1.21.1-tetratefips-v0
registry1.dso.mil/ironbank/tetrate/istio/pilot (source)	minor	1.20.4-tetratefips-v0 -> 1.21.1-tetratefips-v0
registry1.dso.mil/ironbank/tetrate/istio/proxyv2 (source)	minor	1.20.4-tetratefips-v0 -> 1.21.1-tetratefips-v0
registry1.dso.mil/ironbank/tetrate/istio/proxyv2 (source)	minor	1.20.4 -> 1.21.1

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

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This MR has been generated by Renovate Bot

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