@tailwindcss/upgrade replaces Nextjs Image placeholder blur property

Current behavior:

```diff
<Image
  src={image}
-   placeholder='blur'
+   placeholder='blur-sm'
-   className='blur'
+   className='blur-sm'
/>
```

Expected behavior:

```diff
<Image
  src={image}
  placeholder='blur'
-   className='blur'
+   className='blur-sm'
/>
```