fix sleep in spankbang

src/providers/spankbang.rs

@@ -245,7 +245,7 @@ impl SpankbangProvider {
         let mut response = response;
         while response.status().as_u16() == 429 {
             println!("Received 429 Too Many Requests. Waiting 10 seconds before retrying...");
-            sleep(Duration::from_secs(60)).await;
+            ntex::time::sleep(ntex::time::Seconds(60)).await; 
             response = client.get(url.clone()).header("Cookie", cookies.clone()).send().await?;
         }