Wait for releases of onnxruntime and cupy supporting Python 3.14

Not all tests use 3.14 because of the following two dependencies:

- [ ] CuPy already supports Python 3.14 in its [main branch](https://github.com/cupy/cupy/blob/main/pyproject.toml), awaiting release
- [ ] onnxruntime [also](https://github.com/microsoft/onnxruntime/blob/main/setup.py#L632) supports Python 3.14 but was not released

We should check for releases once in a while to see if we can test with 3.14