Renovate: Upgrade Mattermost Package Dependencies

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

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changed milestone to %1.56.0

changed iteration to Big Bang Iterations Mar 7, 2023 - Mar 20, 2023

added kindmaintenance mattermost teambigbang labels

set weight to 1

assigned to @chris.hayter

added statusdoing label

removed statusdoing label

added statusreview label

changed the description

changed the description

mentioned in merge request big-bang/bigbang!2570 (merged)

closed with merge request big-bang/bigbang!2570 (merged)

mentioned in commit big-bang/bigbang@15c82732