Thanks for the PR and great that you found this. Will merge if our pipelines succeed

Thanks for the PR! I have merged the master branch into your feature branch; the CI should hopefully pass now.

I was initially surprised that this issue was not picked up by the NPY201 linting rule that picks up deprecated functions; but, I realise we have explicitly excluded this _colorconv.py from linting as it is vendored code. So, thanks for spotting this.

Anyone else seeing this error now?

/shap/plots/colors/_colorconv.py:819: DeprecationWarning: Converting `np.inexact` or `np.floating` to a dtype is deprecated. The current result is `float64` which is not strictly correct.
  if np.issubdtype(dtype_in, np.dtype(dtype).type):

I'm using numpy==1.26.4.

@jonathanng thanks for the bug report! That looks like a separate issue, so let's track that over at #3782