Update dependency defenseunicorns/zarf to v0.21.1

This MR contains the following updates:

Package	Type	Update	Change
defenseunicorns/zarf	ironbank-github	patch	v0.21.0 -> v0.21.1
defenseunicorns/zarf		patch	v0.21.0 -> v0.21.1

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Release Notes

defenseunicorns/zarf

v0.21.1

Compare Source

Features

• Add new "prepare" stage for components scripts to perform actions on zarf package create by @​jeff-mccoy in https://github.com/defenseunicorns/zarf/pull/660

  components:
    - name: prepare
      scripts:

Note this file will be created in this directory, regardless of where the package create command is called from

    prepare:
      - "touch test-prepare.txt"

##### Development
* Move to official github action for project issue automation by @​renovate in https://github.com/defenseunicorns/zarf/pull/653
##### Dependencies
* Update module sigs.k8s.io/kustomize/api to v0.12.1 by @​renovate in https://github.com/defenseunicorns/zarf/pull/656
* Update module github.com/sigstore/cosign to v1.10.1 by @​renovate in https://github.com/defenseunicorns/zarf/pull/659
* Update module go to 1.19 by @​renovate in https://github.com/defenseunicorns/zarf/pull/657
* Update module github.com/derailed/k9s to v0.26.3 by @​renovate in https://github.com/defenseunicorns/zarf/pull/658

**Full Changelog**: https://github.com/defenseunicorns/zarf/compare/v0.21.0...v0.21.1

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