github: Switch to minio deb and pin working version #399

Job	Run time
Code	4m 25s
Client (1.20.x, ubuntu-latest)	25s
Documentation	5m 41s
Client (1.20.x, macos-latest)	34s
System (1.20.x, cluster, dir)	8m 30s
Client (1.20.x, windows-latest)	2m 18s
System (1.20.x, cluster, btrfs)	8m 32s
System (1.20.x, cluster, lvm)	8m 32s
System (1.20.x, cluster, zfs)	8m 32s
System (1.20.x, cluster, ceph)	7m 53s
System (1.20.x, cluster, random)	8m 32s
System (1.20.x, standalone, dir)	8m 32s
System (1.20.x, standalone, btrfs)	8m 32s
System (1.20.x, standalone, lvm)	8m 33s
System (1.20.x, standalone, zfs)	8m 31s
System (1.20.x, standalone, ceph)	7m 59s
System (1.20.x, standalone, random)	8m 31s
System (stable, cluster, dir)	8m 30s
System (stable, standalone, dir)	8m 31s
System (tip, cluster, dir)	1m 0s
System (tip, standalone, dir)	2m 9s
	2h 14m 42s

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