Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v9.7.3

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	patch	9.7.2 -> 9.7.3

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Upgrade Notices

N/A

added Package Sustainment kindmaintenance mattermost labels

mentioned in issue #116 (closed)

added teamStorage & Collaboration label

assigned to @benjamin.starks

added 1 commit

• bd3ca31b - helm dependency update

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marked this merge request as ready

changed the description

added statusreview label

requested review from @michaelmartin, @chris.oconnell, @kershaw.jacob, @seanthomas007, @samvongsay, @dchen, and @akesterson

added 4 commits

• bd3ca31b...ec497679 - 2 commits from branch main
• c8b6874a - Update registry1.dso.mil/ironbank/opensource/mattermost/mattermost Docker tag to v9.7.3
• 39384b72 - helm dependency update

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added 1 commit

• d41d1ccd - upgrade minio-instance, minio image and mc image

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resolved all threads

approved this merge request

added 1 commit

• 0abe6537 - fix mc release tag

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reset approvals from @benjamin.starks by pushing to the branch

approved this merge request

merged

mentioned in commit 5bc15ef7

mentioned in merge request big-bang/bigbang!4268 (merged)