Linux 5.15 compat: META

[behlendorf]

Motivation and Context

The final 5.15 kernel is available and has been tested.

Description

Increase the Linux-Maximum version in the META file to 5.15.
All of the required compatibility patches have been merged
and the 5.15 kernel has been officially released.

How Has This Been Tested?

Support for 5.15 has been included for some time now. Bump
the supported kernel version to indicate this now that final
5.15 kernel is available and no more breaking changes are
expected.

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.

[rien]

Does anyone have an idea when this will be released or merged into a zfs-<version>-staging branch?