David Peter ca53eefa6f [red-knot] Do not use explicit knot_extensions.Unknown declaration (#15787) ...

## Summary

Do not use an explict `knot_extensions.Unknown` declaration, as per
[this
comment](https://github.com/astral-sh/ruff/pull/15766#discussion_r1930997592).
Instead, use an undefined name to achieve the same effect.

2025-01-28 17:18:22 +01:00

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[red-knot] Do not use explicit knot_extensions.Unknown declaration (#15787)

2025-01-28 17:18:22 +01:00