Update Ironbank

This MR contains the following updates:

Package	Update	Change
gluon	patch	1.1.7 → 1.1.8
registry1.dso.mil/ironbank/big-bang/cypress (source)	retained	15.21.1
registry1.dso.mil/ironbank/elastic/elasticsearch/elasticsearch (source)	patch	9.5.3 → 9.5.4
registry1.dso.mil/ironbank/elastic/kibana/kibana (source)	patch	9.5.3 → 9.5.4
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	minor	v1.36 → v1.37

Cypress remains at 15.21.1 because Gluon 1.1.8 still uses Cypress.env, removed in Cypress 16. A narrow Renovate <16 constraint tracks Gluon #139; package test assertions are unchanged.

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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• Tested and Validated changes

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Upgrade Notices

N/A

Linked issues

Closes: #324 (closed)