git: 9198de8f1079..887a3c533b94 - vendor/openzfs/master - vendor branch updated

From: Martin Matuska <mm_at_FreeBSD.org>
Date: Thu, 09 Nov 2023 10:33:33 UTC
The branch vendor/openzfs/master has been updated by mm:

URL: https://cgit.FreeBSD.org/src/log/?id=9198de8f1079..887a3c533b94

5caeef02fa53 RAID-Z expansion feature
3a81bf4ad282 Workaround to allow openzfs-zfs-dkms install on Ubuntu
a160c153e2f4 Linux: reject read/write mapping to immutable file only on VM_SHARED
1c1be60fa21e Unbreak FreeBSD world build after 3bd4df384
887a3c533b94 Increase L2ARC write rate and headroom