Update Ironbank

This MR contains the following updates:

Package	Update	Change
mimir-distributed (source)	minor	5.6.0 -> 5.7.0
registry1.dso.mil/ironbank/opensource/grafana/mimir (source)	minor	2.15.1 -> 2.16.0
registry1.dso.mil/ironbank/opensource/grafana/rollout-operator (source)	minor	v0.24.0 -> v0.26.0
registry1.dso.mil/ironbank/opensource/nginx/nginx (source)	patch	1.27.4 -> 1.27.5

Complete MR checklist

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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Helm install succeeded for release mimir/mimir-mimir.v1 with chart mimir@5.7.0-bb.0

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• Tested and Validated changes

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Upgrade Notices

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