Renovate: Upgrade Mattermost Package Dependencies

• Follow steps in package update docs to upgrade the package.

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• Update dependency registry1.dso.mil/ironbank/opensource/mattermost/mattermost to v8.1.1

changed the description

added kindmaintenance mattermost priority5 teamXForce labels

set weight to 3

changed iteration to Big Bang Iterations Aug 22, 2023 - Sep 4, 2023

changed milestone to %2.10.0

assigned to @jaredmladner

added statusdoing label

changed the description

changed the description

removed iteration Big Bang Iterations Aug 22, 2023 - Sep 4, 2023

changed iteration to Big Bang Iterations Sep 5, 2023 - Sep 18, 2023

changed the description

changed milestone to %2.11.0

mentioned in merge request big-bang/bigbang!3060 (merged)

closed with merge request big-bang/bigbang!3060 (merged)

mentioned in commit big-bang/bigbang@24c8e441

added priority2 label and removed priority5 label