Add Closed to list of unavailable statuses

[gaelollivier]

Description

Fixes #243

Note: This doesn’t implement the more robust solution I suggested, but this at least unblocked me for now.

Has This Been Tested?

Haven’t thoroughly tested this, just made the change locally and it removed the false positives. I don’t have access to my usual dev environment, so I can’t run the proper dev tools unfortunately.

Checklist:

• [x] I've read the contributing guidelines of this project
• [ ] I've installed and used .pre_commit on all my code
• [ ] I have documented my code, particularly in hard-to-understand areas
• [ ] I have made any necessary corresponding changes to the documentation

[juftin]

A new unavailable status! This looks perfect, thank you.

[juftin]

:tada: This PR is included in version 0.16.2 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: