python3Packages.aiohttp: remove pytest-xdist

Fails reproducible on hydra like this:

```
        try:
            # set_wakeup_fd() raises ValueError if this is not the
            # main thread.  By calling it early we ensure that an
            # event loop running in another thread cannot add a signal
            # handler.
>           signal.set_wakeup_fd(self._csock.fileno())
E           ValueError: set_wakeup_fd only works in main thread of the main interpreter
```

And was remove from upstreams tests due to 10-15% error rate way back
in 2018.

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