Update registry1.dso.mil/ironbank/elastic/kibana/kibana Docker tag to v9.1.0

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/elastic/kibana/kibana (source)	minor	9.0.3 -> 9.1.0

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
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