Import the new 2023a tzdata.zi file and update the expiry dates of the
hardcoded lists of leapseconds to 2023-12-28.
With the new data, Africa/Egypt no longer has a single unbroken sys_info
from 2014-09-25 to chrono::year::max(). Only check up to 2014-09-01 so
that the test isn't sensitive to differences between 2022g and 2023a
data.
libstdc++-v3/ChangeLog:
PR libstdc++/109288
* include/std/chrono (__detail::__get_leap_second_info): Update
expiry date of hardcoded leapseconds list.
* src/c++20/tzdb.cc (tzdb_list::_Node::_S_read_leap_seconds()):
Likewise.
* src/c++20/tzdata.zi: Import new file from 2023a release.
* testsuite/std/time/time_zone/get_info_local.cc: Only check
transitions for Egypt up to 2014.