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/monitor/tach_sensor.hpp b/monitor/tach_sensor.hpp
index b4dc5b5..1468ab1 100644
--- a/monitor/tach_sensor.hpp
+++ b/monitor/tach_sensor.hpp
@@ -1,7 +1,5 @@
 #pragma once
 
-#include <fmt/format.h>
-
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/bus/match.hpp>
@@ -11,6 +9,7 @@
 
 #include <chrono>
 #include <deque>
+#include <format>
 #include <optional>
 #include <utility>
 
@@ -287,7 +286,7 @@
     inline void stopTimer()
     {
         phosphor::logging::log<phosphor::logging::level::DEBUG>(
-            fmt::format("Stop running timer on tach sensor {}.", _name)
+            std::format("Stop running timer on tach sensor {}.", _name)
                 .c_str());
         _timer.setEnabled(false);
     }