[M. UPDATE] x11/py-qtpy 1.5.0 -> 1.5.1

[Elias M. Mariani]

Super trivial update:
https://github.com/spyder-ide/qtpy/blob/v1.5.1/CHANGELOG.md
- Make PythonQtError inherit from RuntimeError to be easily catchable

Regression test passing.
Only consumer is devel/spyder, tested OK.

Cheers.
Elias.

py-qtpy-1.5.1.diff
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