Update submodule thread_pool

rvaser · rvaser · commit 991793fd2872 · 2019-05-30T16:12:33.000+02:00
diff --git a/vendor/thread_pool b/vendor/thread_pool
@@ -1 +1 @@
-Subproject commit 5972e2a9c17426e7b7884633ec9ae8d519d35dfc
+Subproject commit 048da9485390ee8b8a7ecedccc598a06ca4429e2
