random(9): bump removal to FreeBSD 15.0

It has not yet been removed, and still has some in-tree consumers.

PR:		277655
Sponsored by:	The FreeBSD Foundation

Author: emaste

share/man/man9/random.9

@@ -24,7 +24,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\" "
-.Dd March 22, 2021
+.Dd March 18, 2024
 .Dt RANDOM 9
 .Os
 .Sh NAME
@@ -133,7 +133,7 @@ The deprecated
 .Fn random
 function will return a 31-bit value.
 It is obsolete and scheduled to be removed in
-.Fx 14.0 .
+.Fx 15.0 .
 Consider
 .Xr prng 9
 instead and see