Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v10.6.1

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	minor	10.5.1 -> 10.6.1

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

N/A

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #200 (closed)

added teamStorage & Collaboration label

changed the description

mentioned in issue #203

assigned to @pchristiel

added 1 commit

• f08ce8f3 - updated changelog file

Compare with previous version

changed the description

marked this merge request as ready

added statusreview label

requested review from @andrewshoell

requested review from @dchen

approved this merge request

merged

mentioned in commit 116e6c17

mentioned in merge request big-bang/bigbang!5914 (closed)