Update minio/minio Docker tag to vRELEASE.2021-09-15T04-54-25Z

This MR contains the following updates:

Package	Type	Update	Change
minio/minio	ironbank-docker	patch	RELEASE.2021-09-09T21-37-07Z -> RELEASE.2021-09-15T04-54-25Z
minio/minio		patch	RELEASE.2021-09-09T21-37-07Z -> RELEASE.2021-09-15T04-54-25Z
minio/minio	stage	patch	RELEASE.2021-09-09T21-37-07Z -> RELEASE.2021-09-15T04-54-25Z

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