git: 84ffe564dff1..a12c6ed62fcd - vendor/openzfs/master - vendor branch updated

From: Martin Matuska <mm_at_FreeBSD.org>
Date: Wed, 06 May 2026 21:39:13 UTC
The branch vendor/openzfs/master has been updated by mm:

URL: https://cgit.FreeBSD.org/src/log/?id=84ffe564dff1..a12c6ed62fcd

a4a7df886f8f libzfs/mnttab: restore ability to enable/disable cache
6748e7e65ea6 ZTS: add libzfs_mnttab_cache test
c18e8ba87489 Linux 7.1: access dentry d_alias directly
e78a51dd6ffa Fix off-by-one in PREVIOUSLY_REDACTED handler that drops last block
b8d959640352 Fix rare cksum errors after rebuild
0a59f7845c28 Avoid flushing unrelated NFS exports on snapshot unmount
d5099c330b90 Initialize vr_last_txg for rebuild
f828a80cb6e4 CI/GCC: Add Fedora 44, fix build errors and threadsappend
366b1f9a3eab Fix long POSIX_FADV_DONTNEED for single block files
2de4f4c742e7 CI: FreeBSD 15.1 PRERELEASE (#18490)
b68c782d82a7 man: document three missing properties and tunables
5dd912192dcd Update description of spl_schedule_hrtimeout_slack_us
ae37f05d87ad linux: verify stale znodes in legacy fallocate
872f01019345 Zstd: rework ZSTD_isError symbol renaming
a12c6ed62fcd ZTS: Remove threadsappend_001_pos exception