[Lua] Add Immunities to Boreal Hound

[slashtangent]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Adds immunity to Bind and Dark Sleep to the Boreal Hound in Xarcabard

Steps to test these changes

!zone <xarcabard>
Cast bind and sleep on the Boreal Hound

Capture

Packets Only
https://drive.google.com/drive/folders/1nTmqCl3ubHCSVTTwRoeuvKcS1wrhguOa?usp=sharing

[zach2good]

Add Immunities is not a useful commit message - I'll squash and rename, but please think about what the git history might look like after your changes