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/presence/gpio.cpp b/presence/gpio.cpp
index 8e4a6d2..ceba1c6 100644
--- a/presence/gpio.cpp
+++ b/presence/gpio.cpp
@@ -109,7 +109,7 @@
     ad.emplace("GPIO_DEVICE_PATH", (phys.c_str()));
 
     getLogger().log(
-        fmt::format("GPIO presence detect for fan {} said not present but "
+        std::format("GPIO presence detect for fan {} said not present but "
                     "other methods indicated present",
                     fanInventoryPath));
     try
@@ -121,7 +121,7 @@
     catch (const util::DBusError& e)
     {
         getLogger().log(
-            fmt::format("Call to create a {} error for fan {} failed: {}",
+            std::format("Call to create a {} error for fan {} failed: {}",
                         errorName, fanInventoryPath, e.what()),
             Logger::error);
     }