[tz] NIST URLs for leap-seconds.list in leapseconds.awk

[Paul Eggert]

On 2024-01-10 09:20, PoolMUC via tz wrote:

> However, at least for me, and at this time, the hostname ftp.nist.gov does not
> resolve. ftp.boulder.nist.gov does resolve.

Thanks for reporting that. ftp.nist.gov has been flaky for some time, 
and I have the feeling that NIST hasn't wanted us to use it. Perhaps 
their FTP servers were overloaded, perhaps they're trying to discourage 
the use of FTP due to its security issues (but then why use FTP with 
Boulder?), and perhaps they just want to get out of the leap second 
business and let IERS deal with it.

Since the boulder URI is more reliable let's mention only it for the 
NIST URIs. Proposed patch attached.
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