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/manager.cpp b/control/json/manager.cpp
index fe5fc0d..5121e97 100644
--- a/control/json/manager.cpp
+++ b/control/json/manager.cpp
@@ -97,7 +97,7 @@
         log<level::ERR>("Error reloading configs, no changes made",
                         entry("LOAD_ERROR=%s", re.what()));
         FlightRecorder::instance().log(
-            "main", fmt::format("Error reloading configs, no changes made: {}",
+            "main", std::format("Error reloading configs, no changes made: {}",
                                 re.what()));
     }
 }
@@ -539,7 +539,7 @@
         {
             // Log service not found for object
             log<level::DEBUG>(
-                fmt::format(
+                std::format(
                     "Unable to get service name for path {}, interface {}",
                     path, intf)
                     .c_str());