chore(deps): update keycloak

The Iron Bank team is now republishing the upstream keycloak image rather than rebasing it on UBI, so the uids changed. The changes in values.yaml reflect the uid changes.

This MR contains the following updates:

Package	Update	Change
postgresql (source)	minor	18.4.0 -> 18.5.5
registry1.dso.mil/ironbank/opensource/keycloak/keycloak (source)	patch	26.5.4 -> 26.5.5

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