Update Istio-operator to 1.21.1

This MR contains the following updates:

Package	Update	Change
ironbank/opensource/istio/operator	minor	1.20.4 -> 1.21.2
ironbank/tetrate/istio/operator (source)	minor	1.20.4 -> 1.21.1
ironbank/tetrate/istio/operator (source)	minor	1.20.4-tetratefips-v0 -> 1.21.1-tetratefips-v0
registry1.dso.mil/ironbank/opensource/istio/operator	minor	1.20.4 -> 1.21.2
registry1.dso.mil/ironbank/tetrate/istio/operator (source)	minor	1.20.4-tetratefips-v0 -> 1.21.1-tetratefips-v0

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