freebsd-update doesn't refresh leapsecond file

From: void <void_at_f-m.fm>
Date: Tue, 24 Dec 2024 00:49:25 UTC 
On a system that's been always maintained with freebsd-upgrade (and was 
installed when 13.1 was new), the following gets printed in the console on boot

Dec 23 16:00:21 REDACTED ntpd[604]: leapsecond file (‘/var/db/ntpd.leap-seconds.list’): expired 362 days ago

Whenever it's been upgraded, all the required files get merged when the process requests it, as usual.
This didn't just start happening - it's happened since installation. So 13.{1,2,3,4}.
Why is /var/db/ntpd.leap-seconds.list not updated? Worth a PR?
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