Fixed daily_file_sink compilation under c++20

include/spdlog/sinks/daily_file_sink.h

@@ -53,7 +53,7 @@ struct daily_filename_format_calculator
 #if defined(_MSC_VER) && defined(SPDLOG_WCHAR_FILENAMES) // for some reason msvc doesnt allow fmt::runtime(..) with wchar here
         return fmt::format(fmt_filename, now_tm);
 #else
-        return fmt::format(fmt_filename, now_tm);
+        return fmt::format(fmt::runtime(fmt_filename), now_tm);
 #endif
     }
 };