Comparison predicate handling for !=

[paoloq]

Description

Fix issue #5281.

Types of change

Bug fix.

Checklist

• I have submitted the spaCy Contributor Agreement.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

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[svlandeg]

Thanks for the PR, I think this would be a good additional feature to have!