FIX Install spams from correct, up to date PyPI package

[gdurif]

spams will be installed using official repository.

mkl package is also required for better performance.

benchopt test benchmark_lasso is running on my machine (so far, so good).

[gdurif]

Well... benchOpt/benchopt/tests/test_benchmarks.py::test_solver_install[benchmark_lasso-spams] FAILED

See also: getspams/spams-python#17 (thanks @mathurinm)

[mathurinm]

I tried on my computer. I think it is related to the failures we are experiencing in #62 (linking failing during cython compilation). The issue is that on my machine it happens even with python 3.9, while for cd_solver I was able to fix by upgrading to python 3.9

[gdurif]

@mathurinm

Would that be a solution to implement inside benchopt a proper PyPI-to-conda package conversion and installation with:

conda skeleton pypi my_package
conda build my_package
conda install --use-local my_package

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