Description

The datatracker maintains a set of zoneinfo files generated with a fork of vzic from 2003. This generates a set of zoneinfo files in vzic/zoneinfo that are used when generating iCalendar files. Updating these is a manual process that has not been done for a few years.

At least need to update these files. It'd be better to automate or at least schedule regular updates. Additionally, https://github.com/libical/vzic looks at a glance to be an updated version of vzic - unless there's a specific reason to like the 2003 version, we should probably remove the tool from the datatracker repo entirely.

This should be coordinated with #5393.

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