github: Switch to minio deb and pin working version #398

Job	Run time
Code	4m 25s
Client (1.20.x, ubuntu-latest)	24s
Documentation	4m 26s
Client (1.20.x, macos-latest)	33s
System (1.20.x, cluster, dir)	1m 46s
Client (1.20.x, windows-latest)	2m 1s
System (1.20.x, cluster, btrfs)	58s
System (1.20.x, cluster, lvm)	1m 0s
System (1.20.x, cluster, zfs)	2m 8s
System (1.20.x, cluster, ceph)	1m 6s
System (1.20.x, cluster, random)	1m 0s
System (1.20.x, standalone, dir)	1m 3s
System (1.20.x, standalone, btrfs)	57s
System (1.20.x, standalone, lvm)	1m 10s
System (1.20.x, standalone, zfs)	1m 42s
System (1.20.x, standalone, ceph)	58s
System (1.20.x, standalone, random)	1m 4s
System (stable, cluster, dir)	1m 8s
System (stable, standalone, dir)	1m 52s
System (tip, cluster, dir)	58s
System (tip, standalone, dir)	59s
	31m 38s

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