Fix handing issue on macOS Sequoia after completing 1 task (#291)

mole

@@ -81,6 +81,7 @@ check_for_updates() {
     ensure_user_dir "$(dirname "$msg_cache")"
     ensure_user_file "$msg_cache"
 
+    (
         (
             local latest
 
@@ -94,8 +95,8 @@ check_for_updates() {
             else
                 echo -n > "$msg_cache"
             fi
-    ) &
-    disown 2> /dev/null || true
+        ) > /dev/null 2>&1 < /dev/null &
+    )
 }
 
 show_update_notification() {