ConfigureAwait(false) for logout from dispose to prevent deadlock on .NET 461 finalizer

Author: borigas

src/CouchDB.Driver/CouchClient.cs

@@ -303,7 +303,7 @@ public void Dispose()
 
         protected virtual void Dispose(bool disposing)
         {
-            AsyncContext.Run(() => LogoutAsync());
+            AsyncContext.Run(() => LogoutAsync().ConfigureAwait(false));
             _flurlClient.Dispose();
         }