Move to boost::asio::post

This allows entity_manager to compile with BOOST_ASIO_NO_DEPRECATED set.
It was functionally changed a few years ago, and is identical to the
other behavior.

Change-Id: Ib8125fcf9bdddf0bafd46118c4e764f7f83a0c2d
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/healthMonitor.cpp b/healthMonitor.cpp
index 2b3d5fe..f8b2c54 100644
--- a/healthMonitor.cpp
+++ b/healthMonitor.cpp
@@ -821,8 +821,9 @@
         });
 
     // Start the timer
-    io.post(
-        [conn]() { sensorRecreateTimerCallback(sensorRecreateTimer, *conn); });
+    boost::asio::post(io, [conn]() {
+        sensorRecreateTimerCallback(sensorRecreateTimer, *conn);
+    });
     io.run();
 
     return 0;