feat: Add support for 'model/step' MIME type

[kaspnilsson]

Was missing from this allowlist. Does this require additional work?

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🦋 Changeset detected

Latest commit: ca1032a7b39e8ca203296a3460e0cdb5592a8689

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ----------------------- | ----- | | @uploadthing/mime-types | Patch | | uploadthing | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
docs-uploadthing	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 3, 2024 5:16am

[t3dotgg]

Good catch, ty for adding! no additional work, we'll get this in for next release 🙏