ReactiveX / RxPY / 24588286582

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test: skip tkinter scheduler tests on PyPy (all platforms) (#760)

* test: skip tkinter scheduler tests on PyPy (all platforms)

The module creates `tkinter.Tk()` at import time. During PyPy interpreter
shutdown, `_tkinter/app.py`'s `__del__` calls `threading.notify_all`,
which can abort the process with `Fatal Python error: Aborted`. When
this happens inside an xdist worker it takes the worker down and fails
whichever unrelated test happens to be running (e.g. test_case_three),
showing up as a non-deterministic CI failure.

The skip guard previously only covered macOS+PyPy; extend it to all
PyPy platforms so the Linux PyPy job stops flaking.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* style: apply ruff-format to tkinter test skip

Collapse the `pytest.skip(...)` call onto a single line per ruff-format.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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