LU-15583 build: Update ZFS version to 2.1.2

LU-15583 build: Update ZFS version to 2.1.2

Update ZFS version to 2.1.2. The changes are listed in:
https://github.com/openzfs/zfs/releases/tag/zfs-2.1.2

Change-Id: If7c81a4b1fe13e29eea1c277b896223f5c06b31a
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/47326
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Nathaniel Clark <nclark@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>