Updated the zoneinfo timezone data files to version 2021c.
Why it matters
This update ensures that ClickHouse uses the latest timezone definitions, reflecting all recent changes such as daylight saving time adjustments and timezone boundary modifications. It improves accuracy and correctness when working with date and time functions that depend on timezones.How to use it
The update is applied internally as part of the new ClickHouse release; users will benefit from the improved timezone information automatically without any additional configuration.