New release compatible with transformer>=5.5.0?

Hi team 👋

Thanks for the great work on `optimum-executorch`!

I noticed in the `pyproject.toml` that the repo is currently strictly pinned to `"transformers==5.0.0rc1"`. Because the stable Transformers v5 line has advanced significantly, this strict pinning is causing dependency conflicts for users trying to integrate this repo into modern environments.

Are there any plans to bump this dependency to support newer versions of `transformers` (e.g., `>= 5.5.0`), or are there specific breaking changes in the newer v5 releases blocking this?

When should we expect the next release of this library?

Thanks in advance!