[BUG] Don't include the full URL to the issue in the deprecation warning

[ahpook]

Describe the bug
We added the deprecation warning about deny lists in #958. But an unexpected (to me, anyway!) consequence of including the link to the issue in hte deprecation message is that every DRA run that results in a link to the issue. This is creating a ton of noise on the issue and should probably be squelched.

To Reproduce
Check out all the comments in #938

Expected behavior
We should just mention the issue by number rather than include the full URL.

"⚠️ Deprecation Warning: The deny-licenses option is deprecated for possible removal in the next major release. See issue #938 in actions/dependency-review-action for more information."