sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Change-Id: I1c12dfb9df9e4a86e4c13ec16bbf8beeff6edb10
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/redfish-core/lib/certificate_service.hpp b/redfish-core/lib/certificate_service.hpp
index 1f69123..7ae194c 100644
--- a/redfish-core/lib/certificate_service.hpp
+++ b/redfish-core/lib/certificate_service.hpp
@@ -571,7 +571,7 @@
     crow::connections::systemBus->async_method_call(
         [asyncResp, certFile, objectPath, service, url{*parsedUrl}, id, name,
          certificate](const boost::system::error_code& ec,
-                      sdbusplus::message::message& m) {
+                      sdbusplus::message_t& m) {
             if (ec)
             {
                 BMCWEB_LOG_ERROR("DBUS response error: {}", ec);