CI: Add FreeBSD 14.2 RELEASE+STABLE builds
Update the CI to include FreeBSD 14.2 as a regularly tested platform.
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #16869