data: Add 2024a

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This contains the following changes from tzdb (edited to remove details irrelevant to this project):

Release 2024a - 2024-02-01 09:28:56 -0800

  Briefly:
    Kazakhstan unifies on UTC+5 beginning 2024-03-01.
    Palestine springs forward a week later after Ramadan.
    zic no longer pretends to support indefinite-past DST.
    localtime no longer mishandles Ciudad Juárez in 2422.

  Changes to future timestamps

    Kazakhstan unifies on UTC+5.  This affects Asia/Almaty and
    Asia/Qostanay which together represent the eastern portion of the
    country that will transition from UTC+6 on 2024-03-01 at 00:00 to
    join the western portion.  (Thanks to Zhanbolat Raimbekov.)

    Palestine springs forward a week later than previously predicted
    in 2024 and 2025.  (Thanks to Heba Hamad.)  Change spring-forward
    predictions to the second Saturday after Ramadan, not the first;
    this also affects other predictions starting in 2039.

  Changes to past timestamps

    Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00
    not 00:00.  (Thanks to Đoàn Trần Công Danh.)

    From 1947 through 1949, Toronto's transitions occurred at 02:00
    not 00:00.  (Thanks to Chris Walton.)

    In 1911 Miquelon adopted standard time on June 15, not May 15.

  Changes to code

    localtime and related functions no longer mishandle some
    timestamps that occur about 400 years after a switch to a time
    zone with a DST schedule.  In 2023d data this problem was visible
    for some timestamps in November 2422, November 2822, etc. in
    America/Ciudad_Juarez.  (Problem reported by Gilmore Davidson.)