There isn't really a "policy" here. Please feel free to update links that are out-of-date. However, to quote from a similar discussion on Metaa similar discussion on Meta:
The standard way to deal with this is to make the answer not rely on a link in the first place. An answer should contain some sort of relevant summary, excerpt, or explanation from the content it links to so that if the link breaks, the answer is not compromised. If you're finding answers that contain practically only links, they might not be salvageable.