chore(deps): update ironbank

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	minor	11.6.2 -> 11.7.2
registry1.dso.mil/ironbank/opensource/postgres/postgresql (source)	minor	18.3 -> 18.4

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

Add supporting info below

Linked Issue

#272 (closed)

Reviewer only

• Tested and Validated changes

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Upgrade Notices

N/A