Use ZoneInfo as primary source of timezone data

[max-muoto]

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Description

This PRs switches over to ZoneInfo as the primary source of timezone data in DRF. This PR accomplishes several things:

• Adds deprecation warning for a test that relies off pytz.
• Switches over tests that do not rely on pytz functionality over to ZoneInfo.
• Add additional error handling for ZoneInfo timezones. This is because unlike pytz, error checking has to be done more or less manually in able to determine ambiguous and imaginary timezones (see this doc on migrating to ZoneInfo). We previously had exception handling in DateTimeField for pytz errors, but I added manually checking that will cover ZoneInfo timezones.

Django will provide us ZoneInfo instances as long as USE_DEPRECATED_PYTZ is not enabled

Fixes #8577

[auvipy]

thanks for being the go-to guy for zoneinfo migration in several packages I maintain//co-maintain :D

[deronnax]

could not we remove the requirement on pytz?

[cracly]

Hey, is there any progress on this pull request and the underlying issue? I would like to get rid of pytz. Thanks!

[deronnax]

it's has been done months ago #8984