Fix linter for file streaming example

Signed-off-by: Radu Matei <[email protected]>

examples/wasi-http-streaming-file/src/lib.rs

@@ -3,11 +3,11 @@ use std::{fs::File, io::Read};
 use anyhow::Result;
 use futures::SinkExt;
 use spin_sdk::{
-    http::{Fields, IncomingRequest, OutgoingResponse, ResponseOutparam},
+    http::{Headers, IncomingRequest, OutgoingResponse, ResponseOutparam},
     http_component,
 };
 
-const CHUNK_SIZE: usize = 1 * 1024 * 1024; // 1 MB
+const CHUNK_SIZE: usize = 1024 * 1024; // 1 MB
 
 #[http_component]
 async fn handler(req: IncomingRequest, res: ResponseOutparam) {
@@ -17,7 +17,7 @@ async fn handler(req: IncomingRequest, res: ResponseOutparam) {
 async fn stream_file(_req: IncomingRequest, res: ResponseOutparam) -> Result<()> {
     let response = OutgoingResponse::new(
         200,
-        &Fields::new(&[(
+        &Headers::new(&[(
             "content-type".to_string(),
             b"application/octet-stream".to_vec(),
         )]),