[Fix Replicate] Send Prefer:wait header (#1249)

Fixing a bug introduced in
#1208 and more
precisely
[here](https://github.com/huggingface/huggingface.js/pull/1208/files#diff-ba5cb4afef57c85afde67b883b333c80972fc4ac5d3083d929447105ebfbe55fL107).

For Replicate provider, we must send `Prefer: wait` header as this is
the only path we support for now.

---

Tested locally and it fixes the textToVideo issue we have on
https://huggingface.co/Wan-AI/Wan2.1-T2V-14B

```ts
import { HfInference } from "@huggingface/inference";
import fs from "fs/promises";

async function generateTextToVideo() {
	const hf = new HfInference("xxx");
	const res = await hf.textToVideo({
		inputs: "a cat swimming in an ocean of bananas",
		provider: "replicate",
		model: "Wan-AI/Wan2.1-T2V-14B",
	});

	const arrayBuffer = await res.arrayBuffer();
	const buffer = Buffer.from(arrayBuffer);
	await fs.writeFile("output.mp4", buffer);
}

generateTextToVideo();
```



https://github.com/user-attachments/assets/4234c65e-ab11-45e0-9e29-825f88b2be49



cc @SBrandeis @kefranabg @zeke

Author: Wauplin

packages/inference/src/providers/replicate.ts

@@ -26,7 +26,7 @@ const makeBody = (params: BodyParams): Record<string, unknown> => {
 };
 
 const makeHeaders = (params: HeaderParams): Record<string, string> => {
-	return { Authorization: `Bearer ${params.accessToken}` };
+	return { Authorization: `Bearer ${params.accessToken}`, Prefer: "wait" };
 };
 
 const makeUrl = (params: UrlParams): string => {