add pytz to pyproject.toml

[csrgxtu]

hi, when i follow the following instruction install tiktok-uploader

and run got an ModuleNotFoundError

OS: Mac os 13.4 (22F66) Python: CPython 3.11.5

So i added it and test it in my virtualenv, now works.

[csrgxtu]

https://pythonhosted.org/pytz/

this 3rd party module isn't a std module built in with Python, so need included it into the requirements.