contrib/tzdata: import tzdata 2024b
Changes: https://github.com/eggert/tz/blob/2024b/NEWS
Approved by: so
Security: FreeBSD-EN-25:03.tzdata
(cherry picked from commit e273650f2c538034b45f78e670a89cbf333ab6db)
(cherry picked from commit 7eb0b02bc4eddee6c916ab6a01ec92e0b9dc867e)