Fix tidy warning

include/spdlog/details/registry-inl.h

@@ -184,7 +184,7 @@ SPDLOG_INLINE void registry::flush_on(level::level_enum log_level)
 SPDLOG_INLINE void registry::flush_every(std::chrono::seconds interval)
 {
     std::lock_guard<std::mutex> lock(flusher_mutex_);
-    std::function<void()> clbk = std::bind(&registry::flush_all, this);
+    auto clbk = [this](){this->flush_all();};
     periodic_flusher_ = details::make_unique<periodic_worker>(clbk, interval);
 }