[tz] trailing whitespace in IERS leap-seconds.list file

Martin Burnicki writes that the IERS's current leap-seconds.list file has a notice that it's in the public domain. Thanks: this means there's no copyright issue in including a copy of the file in the Time Zone Database (TZDB). While testing that, though, I got the following warning from our version control system: .git/rebase-apply/patch:284: trailing whitespace. # Since the adoption of this system in 1972 it has been necessary to add a number of seconds to UTC, warning: 1 line adds whitespace errors. This warning occurs because line 21 of <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list> contains a trailing space character. Could you please remove it? That will lessen aggravation downstream. Thanks.