Adapt CI for multiple OS

[dobraczka]

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[codecov]

Codecov Report

Merging #23 (d686e3f) into main (8179f68) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head d686e3f differs from pull request most recent head 8e82921. Consider uploading reports for the commit 8e82921 to get more accurate results

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   89.79%   89.79%           
=======================================
  Files          22       22           
  Lines         960      960           
=======================================
  Hits          862      862           
  Misses         98       98           

Flag	Coverage Δ
unittests	89.79% <100.00%> (ø)

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Files	Coverage Δ
kiez/hubness_reduction/mutual_proximity.py	95.65% <100.00%> (ø)
kiez/neighbors/__init__.py	100.00% <100.00%> (ø)
kiez/neighbors/approximate/nmslib.py	98.18% <ø> (ø)
kiez/neighbors/approximate/nng.py	80.39% <100.00%> (ø)
...z/neighbors/approximate/random_projection_trees.py	85.56% <100.00%> (ø)
kiez/neighbors/exact/sklearn_nearest_neighbors.py	75.00% <100.00%> (ø)

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