arrow

MINOR: [Python] Increase timeout in TestThreadedCSVTableRead::test_cancellation (#41768)

We hit this in conda-forge on some runners:
```
=================================== FAILURES ===================================
__________________ TestThreadedCSVTableRead.test_cancellation __________________
[...]
        # Interruption should have arrived timely
>       assert last_duration <= 1.0
E       assert 1.2137842178344727 <= 1.0

pyarrow/tests/test_csv.py:1473: AssertionError
----------------------------- Captured stdout call -----------------------------
workload size: 100000
workload size: 300000
workload size: 900000
workload size: 2700000
workload size: 8100000
```

Give a little bit more time for the expected duration so conda-forge's test suite doesn't fail spuriously (and then have to be restarted manually).

Authored-by: H. Vetinari <h.vetinari@gmx.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>