Classic GM problem. Its a sloppy design built in to the collapsable steering shaft in the steering column.
Seen it lots of times. Its not unsafe, just noisy.
There is service bulletins for the problem, and it requires the lower half of the steering shaft be replaced.
On a 2008 you might get it fixed free, if you dog the dealer where you bought it. Take a copy of the service bulletin with you, or they will do there best to dodge the issue.