Change io_service to io_context

This was renamed a while back in boost to be compliant with the
std::executors proposal.

Change-Id: Ib56544a0a7478990d18fe9e0bbbd8db1e52fa5b8
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/src/PSUSensorMain.cpp b/src/PSUSensorMain.cpp
index b7067e4..a9db462 100644
--- a/src/PSUSensorMain.cpp
+++ b/src/PSUSensorMain.cpp
@@ -283,7 +283,7 @@
 }
 
 static void createSensorsCallback(
-    boost::asio::io_service& io, sdbusplus::asio::object_server& objectServer,
+    boost::asio::io_context& io, sdbusplus::asio::object_server& objectServer,
     std::shared_ptr<sdbusplus::asio::connection>& dbusConnection,
     const ManagedObjectType& sensorConfigs,
     const std::shared_ptr<boost::container::flat_set<std::string>>&
@@ -913,7 +913,7 @@
 }
 
 void createSensors(
-    boost::asio::io_service& io, sdbusplus::asio::object_server& objectServer,
+    boost::asio::io_context& io, sdbusplus::asio::object_server& objectServer,
     std::shared_ptr<sdbusplus::asio::connection>& dbusConnection,
     const std::shared_ptr<boost::container::flat_set<std::string>>&
         sensorsChanged)
@@ -1047,7 +1047,7 @@
 
 int main()
 {
-    boost::asio::io_service io;
+    boost::asio::io_context io;
     auto systemBus = std::make_shared<sdbusplus::asio::connection>(io);
 
     sdbusplus::asio::object_server objectServer(systemBus, true);