Fix mypy

[hugovk]

CI has started failing:

.venv/bin/mypy deadcode
deadcode/visitor/utils.py:61: error: Unused "type: ignore" comment 
[unused-ignore]
            parts.append(str(id(decorator)))  # type: ignore
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Found 1 error in 1 file (checked 27 source files)

https://github.com/albertas/deadcode/actions/runs/17272794945/job/49021791684

[hugovk]

Mypy now passes on CI: https://github.com/hugovk/deadcode/actions/runs/17404425543