docs(changeset): #5660 is not a breaking change

[gr2m]

Existing code continues to work.

Example

Before

import { convertUint8ArrayToBase64 } from '@ai-sdk/provider-utils';

// Had to manually convert binary data to base64
const fileData = new Uint8Array([0, 1, 2, 3]);
const filePart = {
  type: 'file',
  mediaType: 'application/pdf',
  data: convertUint8ArrayToBase64(fileData), // Required conversion
};

After

// Can use binary data directly
const fileData = new Uint8Array([0, 1, 2, 3]);
const filePart = {
  type: 'file', 
  mediaType: 'application/pdf',
  data: fileData, // Direct Uint8Array support
};