Renovate: Upgrade Keycloak Package Dependencies

• Use Earthly to generate new Keycloak image with plugins.
• Upload image to this repo's container registry.
• Update image tag in chart/values.yaml

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• Update Ironbank to v18 (major) (ironbank/opensource/keycloak/keycloak, registry1.dso.mil/ironbank/opensource/keycloak/keycloak)