Updates for fmtlib 7

Update submodules & tracking branches

.gitmodules

@@ -1,6 +1,8 @@
 [submodule "extern/lzokay"]
 	path = extern/lzokay
 	url = https://github.com/jackoalan/lzokay.git
+	branch = master
 [submodule "extern/fmt"]
 	path = extern/fmt
 	url = https://github.com/fmtlib/fmt
+	branch = master

include/athena/Global.hpp

@@ -156,7 +156,7 @@ template <typename First, typename... Rest>
 constexpr auto __FIRST_ARG__(First first, Rest...) { return first; }
 template <typename S, typename... Args>
 auto __make_args_checked__(const S& format_str, Args&&... args) {
-  return fmt::internal::make_args_checked<Args...>(format_str, std::forward<Args>(args)...);
+  return fmt::make_args_checked<Args...>(format_str, std::forward<Args>(args)...);
 }
 
 #ifndef NDEBUG

src/athena/Global.cpp

@@ -57,7 +57,7 @@ static void __defaultExceptionHandler(athena::error::Level level, const char* fi
     break;
   }
 
-  std::string msg = fmt::internal::vformat(fmt, args);
+  std::string msg = fmt::vformat(fmt, args);
   std::cerr << levelStr << " " << file << " " << function << "(" << line << "): " << msg << std::endl;
 }