Update vendor/openzfs to master-9305ff2ed
Notable upstream pull request merges:
#11153 Scalable teardown lock for FreeBSD
#11651 Don't bomb out when using keylocation=file://
#11667 zvol: call zil_replaying() during replay
#11683 abd_get_offset_struct() may allocate new abd
#11693 Intentionally allow ZFS_READONLY in zfs_write
#11716 zpool import cachefile improvements
#11720 FreeBSD: Clean up zfsdev_close to match Linux
#11730 FreeBSD: bring back possibility to rewind the
checkpoint from bootloader