change typo of threads to tasks

wire/cli/src/sigint.rs

···
         if let SIGINT = signal
             && !should_shutdown.load(std::sync::atomic::Ordering::Relaxed)
         {
-            info!("Received SIGINT, attempting to shut down executor threads.");
+            info!("Received SIGINT, attempting to shut down executor tasks.");
             should_shutdown.store(true, std::sync::atomic::Ordering::Relaxed);
         }
     }