Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v10.1.2

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	patch	10.1.1 -> 10.1.2

Complete MR checklist

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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• Tested and Validated changes

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Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #182 (closed)

added teamStorage & Collaboration label

assigned to @justinguidry11

marked this merge request as ready

changed the description

added statusreview label

marked the checklist item Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md as completed

marked the checklist item Update Docs with new/updated steps as needed as completed

marked the checklist item Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines as completed

marked the checklist item Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md as incomplete

marked the checklist item Update Docs with new/updated steps as needed as incomplete

marked the checklist item Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines as incomplete

requested review from @akesterson, @chris.oconnell, @michaelmartin, @benjamin.starks, @dchen, @samvongsay, and @kershaw.jacob

approved this merge request

merged

mentioned in commit 08474a8b

mentioned in merge request big-bang/bigbang!5339 (merged)