zfs: merge openzfs/zfs@8f1b7a6fa

Notable upstream pull request merges:
#15839 c3f2f1aa2 vdev probe to slow disk can stall mmp write checker
#15888 5044c4e3f Fast Dedup: ZAP Shrinking
#15996 db499

zfs: merge openzfs/zfs@8f1b7a6fa

Notable upstream pull request merges:
#15839 c3f2f1aa2 vdev probe to slow disk can stall mmp write checker
#15888 5044c4e3f Fast Dedup: ZAP Shrinking
#15996 db499e68f Overflowing refreservation is bad
#16118 67d13998b Make more taskq parameters writable
#16128 21bc066ec Fix updating the zvol_htable when renaming a zvol
#16130 645b83307 Improve write issue taskqs utilization
#16131 8fd3a5d02 Slightly improve dnode hash
#16134 a6edc0adb zio: try to execute TYPE_NULL ZIOs on the current task
#16141 b28461b7c Fix arcstats for FreeBSD after zfetch support

Obtained from: OpenZFS
OpenZFS commit: 8f1b7a6fa6762ea4c89198ceb11c521f80b92ddc

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