Drop dependency on pytz in favor of zoneinfo

[aDramaQueen]

Proposal:
Hi, pytz is/was a good llibrary. But it's obsolete since PEP 615. In the long run, you should not use this 3rd party package, but the language integrated functionality.
Even big frameworks like Django start dropping pytz.

Current behavior:
Dependent from pytz

Desired behavior:
Independent from pytz

Alternatives considered:
Ignore it and hope pytz will be supported as long as possible.

Use case:
Dropping unnecessary dependencies leads to cleaner & less code. This reduces your effort to keep your dependencies up to date.

[bednar]

Hi @aDramaQueen,

thanks for suggestion. We will take a look.

Regards