Update minio/mc Docker tag to vRELEASE.2020-09-23T20-02-13Z

This MR contains the following updates:

Package	Type	Update	Change
minio/mc	ironbank-docker	patch	RELEASE.2020-09-18T00-13-21Z -> RELEASE.2020-09-23T20-02-13Z
minio/mc		patch	RELEASE.2020-09-18T00-13-21Z -> RELEASE.2020-09-23T20-02-13Z
minio/mc	stage	patch	RELEASE.2020-09-18T00-13-21Z -> RELEASE.2020-09-23T20-02-13Z

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