make gensim CI great again #3488
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I suspect the latest numpy and/or scipy wheels are the cause of the recent slowdown, because the tests that ran on 2023/06/01 against the versions that I'm pinning in this commit were much faster.
This was referenced Aug 23, 2023
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Fix compiled extension building.
pip 23.2.1 (and newer) runs build_ext on its own, using whatever cython is specified in pyproject.toml. If use use Cython 3.0.0 to build the compiled extensions, then they will be an order of magnitude slower (not sure why, but it's reproducible) so I'm pinning the Cython version to <3.0.0.
The separate build_ext step is no longer necessary; in fact, it was getting in the way because it doesn't respect pyproject.toml, so it may end up using an unwanted version of Cython.