Update registry1.dso.mil/ironbank/opensource/postgres/postgresql Docker tag to v18

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/postgres/postgresql (source)	major	17.6 -> 18.0
ironbank/opensource/minio/minio (source)	minor	RELEASE.2025-09-07T16-13-09Z -> RELEASE.2025-10-15T17-29-55Z
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	patch	11.0.2 -> 11.0.4
gluon	patch	0.9.5 -> 0.9.6

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

Postgres requires a dump/restore using pg_dumpall or using pg_upgrade for migrating data to a new major release. Documentation and other changes can be found here: https://www.postgresql.org/docs/18/release-18.html#RELEASE-18-MIGRATION

Linked Issue

issue