Diffusion Transformers License

### Describe the bug

From this [HN thread](https://news.ycombinator.com/item?id=40478921): the Diffusion Transformer pipeline code includes a license `Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)` at the top:
https://github.com/huggingface/diffusers/blob/b69fd990ad8026f21893499ab396d969b62bb8cc/src/diffusers/pipelines/dit/pipeline_dit.py#L1-L2

IIUC this is incompatible with the repo-wide Apache 2.0 license. Is it a bug that the CC-BY-NC was included for DiT, or does the repo-wide license need to be changed?

### Reproduction

See linked code

### Logs

_No response_

### System Info

Diffusers v0.27.2

### Who can help?

_No response_