pkg_resources is deprecated as an API

```
pytvm/engine/engine_c.py:158: UserWarning: pkg_resources is deprecated as an API. 
See https://setuptools.pypa.io/en/latest/pkg_resources.html. 
The pkg_resources package is slated for removal as early as 2025-11-30. 
Refrain from using this package or pin to Setuptools<81.
```