pythonPackages.pyowm: disable python2
pythonPackages.pyowm: disable python2

- Python2 support has been deprecated in 2.9 (https://github.com/csparpa/pyowm/releases/tag/2.9.0)
- Python-3.3 support dropped in 2.10 (https://github.com/csparpa/pyowm/releases/tag/2.10)

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