Fix close YamuxedConnection (#301)

* Keep alive YamuxedConnection during close

* weak_from_this in adjustExpireTimer

Author: kamilsa

src/muxer/yamux/yamuxed_connection.cpp

@@ -533,6 +533,8 @@ namespace libp2p::connection {
       return;
     }
 
+    // Keep alive until method completion
+    auto self = shared_from_this();
     started_ = false;
 
     SL_DEBUG(log(), "closing connection, reason: {}", notify_streams_code);
@@ -712,7 +714,11 @@ namespace libp2p::connection {
                "scheduling expire timer to {} msec",
                config_.no_streams_interval.count());
       inactivity_handle_ = scheduler_->scheduleWithHandle(
-          [this] { onExpireTimer(); },
+          [weak_ptr(weak_from_this())] {
+            if (auto self = weak_ptr.lock()) {
+              self->onExpireTimer();
+            }
+          },
           scheduler_->now() + config_.no_streams_interval);
     }
   }