Fixed clang c++20 compile

include/spdlog/sinks/daily_file_sink.h

@@ -50,7 +50,7 @@ struct daily_filename_format_calculator
     {
         // generate fmt datetime format string, e.g. {:%Y-%m-%d}.
         filename_t fmt_filename = fmt::format(SPDLOG_FILENAME_T("{{:{}}}"), filename);
-        return fmt::format(fmt_filename, now_tm);
+        return fmt::format(fmt::runtime(fmt_filename), now_tm);
     }
 };