Update Ironbank

This MR contains the following updates:

Package	Update	Change
bb-common	minor	1.5.0 → 1.6.1
gluon	patch	1.1.7 → 1.1.9
registry1.dso.mil/ironbank/opensource/grafana/enterprise-metrics (source)	patch	v2.17.18 → v2.17.19
registry1.dso.mil/ironbank/opensource/grafana/mimir (source)	patch	3.2.0 → 3.2.1
registry1.dso.mil/ironbank/opensource/grafana/rollout-operator (source)	minor	v0.39.0 → v0.40.0
registry1.dso.mil/ironbank/opensource/nginx/nginx (source)	patch	1.31.4 → 1.31.6

Complete MR checklist

Assignee

• 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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• Tested and Validated changes

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Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)

Closes #132 (closed)