Fix CQS signal facebook-unused-include-check in fbcode/folly/hash [A]

Reviewed By: DenisYaroshevskiy

Differential Revision: D85059483

fbshipit-source-id: e22a2b2888acb8f6256c6f121a2f128ec9f48933

Author: Dmitry Polukhin

folly/hash/Checksum.cpp

@@ -17,7 +17,7 @@
 #include <folly/hash/Checksum.h>
 
 #include <algorithm>
-#include <stdexcept>
+#include <stdexcept> // IWYU pragma: keep
 
 #include <boost/crc.hpp>