Fix task memory leak in nvim-core pending request cleanup loop

nvim-core/src/lib.rs

@@ -237,6 +237,9 @@ async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
         let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(10));
         loop {
             interval.tick().await;
+            if Arc::strong_count(&pending_clone3) <= 1 {
+                break; // Socket closed and other tasks finished, no need to keep cleaning up
+            }
             pending_clone3.lock().await.retain(|_, sender| !sender.is_closed());
         }
     });