Cargo.lock: bump iana-time-zone
0.1.59 was yanked by upstream because it had a breaking change: https://github.com/strawlab/iana-time-zone/pull/127
Update to 0.1.60.
0.1.59 was yanked by upstream because it had a breaking change: https://github.com/strawlab/iana-time-zone/pull/127
Update to 0.1.60.