[ISBN Verifier] Error in tests

[Keftcha]

Check if the X character is only the verification digit

PR according to this topic.

Resolve exercism/python#4014

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[IsaacG]

+cc @ErikSchierboom for write approval

[Keftcha]

Hi,
I see that the pipeline didn't pass because of a 500 error on a service:

### Errors in exercises/secret-handshake/metadata.toml

* [500] [https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047](https://www.imdb.com/title/tt0058331/quotes/?item=qt0437047) | Network error: Internal Server Error

I there a way to retry running the pipeline or should I amend my commit to re-push it ?

[IsaacG]

I there a way to retry running the pipeline or should I amend my commit to re-push it ?

The test can be manually reran by people with access ... but that test failure is unrelated to this PR so I would just ignore it.

[Keftcha]

Thanks you !