use std::format instead of fmt::format

The std::format is sufficient for the uses in this repository except
for in one file (override_fan_target.cpp, since P2286 isn't supported
by GCC yet).  Switch to std::format whenever possible.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib2576fb530a4d7ce238e1b0bd95b40b476ec2107
diff --git a/control/json/triggers/signal.cpp b/control/json/triggers/signal.cpp
index 7169d69..5e78d6e 100644
--- a/control/json/triggers/signal.cpp
+++ b/control/json/triggers/signal.cpp
@@ -21,13 +21,12 @@
 #include "handlers.hpp"
 #include "trigger_aliases.hpp"
 
-#include <fmt/format.h>
-
 #include <nlohmann/json.hpp>
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/bus/match.hpp>
 
 #include <algorithm>
+#include <format>
 #include <functional>
 #include <iterator>
 #include <memory>
@@ -206,7 +205,7 @@
             // TODO How to handle this? Create timer to keep checking for
             // service to appear? When to stop checking?
             log<level::ERR>(
-                fmt::format("Events will not be triggered by name owner changed"
+                std::format("Events will not be triggered by name owner changed"
                             "signals from service of path {}, interface {}",
                             member, group.getInterface())
                     .c_str());
@@ -256,7 +255,7 @@
             return std::move(list) + ", " + signal.first;
             });
         auto msg =
-            fmt::format("Event '{}' requires a supported signal given to be "
+            std::format("Event '{}' requires a supported signal given to be "
                         "triggered by signal, available signals: {}",
                         eventName, availSignals);
         log<level::ERR>(msg.c_str());