Update to 2023agtz from https://github.com/JodaOrg/global-tz

Update to 2023agtz from https://github.com/JodaOrg/global-tz
 *  Egypt now uses DST again, from April through October.
 *  This year Morocco springs forward April 23, not April 30.
 *  Palestine delays the start of DST this year.
 *  Much of Greenland still uses DST from 2024 on.
 *  America/Yellowknife now links to America/Edmonton.