Update Minio Instance for Mattermost

Update when the BB Minio is updated.

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assigned to @echuang

For these minio updates the MR into BB will need to include the new tags for the following packages to not break anything:

• minio-operator 4.2.3
• minio 4.2.3
• mattermost - minio dependency version 4.2.3

changed iteration to Big Bang Iterations Sep 7, 2021 - Sep 20, 2021

changed milestone to %1.17.0

mentioned in merge request !860 (merged)

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closed with merge request !860 (merged)

mentioned in commit 227e6021

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