Update minio/mc Docker tag to vRELEASE.2020-10-03T02-54-56Z

This MR contains the following updates:

Package	Type	Update	Change
minio/mc	ironbank-docker	minor	RELEASE.2020-09-23T20-02-13Z -> RELEASE.2020-10-03T02-54-56Z
minio/mc		minor	RELEASE.2020-09-23T20-02-13Z -> RELEASE.2020-10-03T02-54-56Z
minio/mc	stage	minor	RELEASE.2020-09-23T20-02-13Z -> RELEASE.2020-10-03T02-54-56Z

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