Debian ZFS packaging team add warning, ZFS unsupported since Linux 6.12

The headline used here is completely misleading. They're ADDING support, not removing it.

"OpenZFS has not yet officially supported PREEMPT_RT kernels. Since Linux 6.12, PREEMPT_RT has been merged into the mainline kernel, making such configurations more accessible; however, this does not imply that OpenZFS has been validated against them. The build may fail, and even if it succeeds, compatibility issues and instability, including possible data corruption, may occur."

"RT kernels"