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major:
- Update CI test environment to Python 3.8, 3.9, 3.10, 3.11 and drop 3.7
- Remove support for Python 3.6 and Python 3.7
- Fix scipy version temporarily until `gensim` releases a patch for the following issue
Source: https://github.com/piskvorky/gensim/issues/3525
- Temporarily commented three tests in `test_doc2vec.py` for the same reason above
Source: https://github.com/fidelity/textwiser/blob/master/tests/test_doc2vec.py
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