Update minio images for arm64 machines
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What does this MR do?
The default minio/minio:RELEASE.2017-12-28T01-21-00Z and minio/mc:RELEASE.2018-07-13T00-53-22Z support only amd64 machines.
This MR fixes them for arm64 machines. I tested them on Oracle ARM Compute Instance.
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Merge Request Title and Description are up to date, accurate, and descriptive. 
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MR targeting the appropriate branch. 
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MR has a green pipeline. 
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Documentation created/updated. 
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Tests added/updated, and test plan for scenarios not covered by automated tests. 
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Equivalent MR/issue for omnibus-gitlab opened. 
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MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab. 
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Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab chart. 
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