Cancel recovery CTS on connection Dispose

Author: AndreReise

projects/RabbitMQ.Client/Impl/AutorecoveringConnection.cs

@@ -292,6 +292,20 @@ public async ValueTask DisposeAsync()
                 return;
             }
 
+            try
+            {
+#if NETSTANDARD2_0
+                _recoveryCancellationTokenSource.Cancel();
+#else
+                await _recoveryCancellationTokenSource.CancelAsync()
+                    .ConfigureAwait(false);
+#endif
+            }
+            catch
+            {
+                // Ensure dispose does not throw any exceptions.
+            }
+
             try
             {
                 await _innerConnection.DisposeAsync()