linux 6.3 compat changes for truenas/zfs-2.1-release

[ixhamza]

The CI workflow was no longer compiling successfully after its container recently moved to Linux 6.3. This patch adds compatibility support for Linux kernel 6.3 for the truenas zfs-2.1 branch.

How Has This Been Tested?

By testing build on 5.15, 6.1, and 6.3 kernel versions.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.