Fix tracing span, using official mwbot crate

src/updater.rs

@@ -25,7 +25,7 @@ async fn update_all_teachers(bot: &Bot) {
     tracing::info!("Updates all pages");
 }
 
-#[tracing::instrument(skip_all, fields(index))]
+#[tracing::instrument(skip(page, wait_duration))]
 async fn process_page(wait_duration: Duration, index: u32, page: mwbot::Page) {
     tracing::info!("Next up");
     sleep(wait_duration).await;