fix: More fix of ml_dtypes<0.5

[oraluben]

This is a followup of #198 of a missing fix.

[gemini-code-assist]

Summary of Changes

Hello @oraluben, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a compatibility issue with the ml_dtypes library by modifying how the float4_e2m1fn data type is registered. The change ensures that this specific data type is only added if it is available in the installed ml_dtypes version, thereby preventing runtime errors when using older versions of the library. This is a follow-up fix to a previous attempt to resolve this issue.

Highlights

• ml_dtypes Compatibility: Introduced a conditional check to register ml_dtypes.float4_e2m1fn only if it exists, ensuring compatibility with ml_dtypes versions older than 0.5.0 and preventing attribute errors.

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[gemini-code-assist]

Code Review

This pull request aims to fix a compatibility issue with older versions of ml_dtypes by adding a hasattr check for float4_e2m1fn. The change is in the right direction, but it's incomplete and could still lead to crashes with very old ml_dtypes versions. I've suggested correcting a version number in a comment and pointed out that other recently added dtypes also need to be guarded for a complete fix.

[tqchen]

please fix lint