Update minio/mc Docker tag to vRELEASE.2021-05-26T19-19-26Z

This MR contains the following updates:

Package	Type	Update	Change
minio/mc		patch	RELEASE.2021-05-18T03-39-44Z -> RELEASE.2021-05-26T19-19-26Z
minio/mc	stage	patch	RELEASE.2021-05-18T03-39-44Z -> RELEASE.2021-05-26T19-19-26Z

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