Draft: Update Ironbank Docker tags

This MR contains the following updates:

Package	Update	Change
ironbank/big-bang/base	major	0.1.1 -> 1.0.0
registry1.dso.mil/ironbank/bitnami/postgres-exporter	minor	0.9.0 -> 0.10.0
registry1.dso.mil/ironbank/opensource/postgres/postgresql12	minor	12.8 -> 12.9

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