:bug: set threadpool's queue_size

diff --git a/util b/util
index 750ff229bd9e4b550684a341dcea6c24ecd1f362..794ebb72427e9baf957ffbba306be864899d2728 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 750ff229bd9e4b550684a341dcea6c24ecd1f362
+Subproject commit 794ebb72427e9baf957ffbba306be864899d2728