Changes:

- CI fix.
- Renames request::fail_* to request::cancel_*.
- Adds a second parameter to async_run.
- Adds request::retry flag.

benchmarks/cpp/asio/echo_server_direct.cpp

@@ -9,6 +9,7 @@
 //
 
 #include <cstdio>
+#include <iostream>
 #include <boost/asio.hpp>
 #if defined(BOOST_ASIO_HAS_CO_AWAIT)