Draft: Update Ironbank

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost-operator	minor	v1.18.0 -> v1.19.0
registry1.dso.mil/ironbank/opensource/mattermost/mattermost-operator	minor	1.18.0 -> 1.19.0

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This MR has been generated by Renovate Bot.

added Package Sustainment kindmaintenance mattermostoperator labels

mentioned in issue #301