Unnecessary pytz dependency

[jmakovicka]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

Conda-build still contains pytz in

• pyproject.toml
• requirements.txt
• meta.yaml

although last pytz usage has been removed in 5353b38

With other packages migrating from pytz to zoneinfo, these dependencies should be removed too.

Conda Info

Conda Config

Conda list

Additional Context

No response