Help minio-go with over-allocations on Multi-Part Upload

[bwplotka]

See: https://github.com/minio/mc/issues/3376#issuecomment-805994723

Currently to mitigate issue on our side from this https://github.com/thanos-io/thanos/issues/3917 we had to revert that particular commit and use tmp fork instead: https://github.com/bwplotka/minio-go/commit/f9927e5255a6ade9d3728e2651c6ae24f4367692

This issue is to figure out long term solution that will work for us and for minio client. The reason why we can revert it and minio not, is because we don't make concurrent uploads.

[bwplotka]

This is not done, with still are on my fork, and we need to fix minio upstream in a way that will not produce race and will be efficient in the same time 🤗

[bwplotka]

Contributed the latest, even further optimized version: https://github.com/minio/minio-go/pull/1673

[stale[bot]]

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[douglascamata]

@bwplotka I guess this can be closed now?