Backports ZoneInfo

backports.zoneinfo provides a backport of the `zoneinfo` module from Python 3.9 for users running Python 3.6, 3.7, or 3.8. It offers an efficient, C-based implementation of the `zoneinfo` module, allowing older Python versions to use the standard library's `ZoneInfo` object for handling IANA time zones. The current version is 0.2.1, with releases typically happening as needed for bug fixes or minor enhancements.