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/actions/request_target_base.cpp b/control/json/actions/request_target_base.cpp
index 4bcaabb..f52a19b 100644
--- a/control/json/actions/request_target_base.cpp
+++ b/control/json/actions/request_target_base.cpp
@@ -19,12 +19,11 @@
 #include "../zone.hpp"
 #include "group.hpp"
 
-#include <fmt/format.h>
-
 #include <nlohmann/json.hpp>
 #include <phosphor-logging/log.hpp>
 
 #include <algorithm>
+#include <format>
 
 namespace phosphor::fan::control::json
 {
@@ -75,7 +74,7 @@
                 {
                     // Unsupported group member type for this action
                     log<level::ERR>(
-                        fmt::format("Action {}: Unsupported group member type "
+                        std::format("Action {}: Unsupported group member type "
                                     "given. [object = {} : {} : {}]",
                                     getName(), member, group.getInterface(),
                                     group.getProperty())