MM 5.39.0 Update

Package Owner Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost/-/merge_requests/65

https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost/-/tags/0.2.2-bb.0

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/784