replace pytorch direct dep once pytorch cpu supports 3.13

specifically we need to replace (in `pyproject.toml`)
```
dependencies = [
    "torch @ https://download.pytorch.org/whl/cpu/torch-2.8.0%2Bcpu-cp313-cp313-manylinux_2_28_x86_64.whl#sha256=8f81dedb4c6076ec325acc3b47525f9c550e5284a18eae1d9061c543f7b6e7de",
```
with something like
```
dependencies = [
    "torch==2.8.0+cpu",
```
when pytorch supports `python 3.13`.

so we can generate a pypi release.