MAINT cloudpickle 1.5.0

[ogrisel]

Closes #1089

[codecov]

Codecov Report

Merging #1090 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1090      +/-   ##
==========================================
- Coverage   94.52%   94.28%   -0.25%     
==========================================
  Files          47       47              
  Lines        6910     6910              
==========================================
- Hits         6532     6515      -17     
- Misses        378      395      +17     

Impacted Files	Coverage Δ
joblib/test/test_store_backends.py	91.42% <0.00%> (-5.72%)	⬇️
joblib/_parallel_backends.py	94.92% <0.00%> (-1.57%)	⬇️
joblib/test/test_parallel.py	95.62% <0.00%> (-1.54%)	⬇️
joblib/parallel.py	97.00% <0.00%> (+0.54%)	⬆️

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[ogrisel]

Note sure what is causing the segfaults when running the sklearn tests but this is not related to the cloudpickle upgrade as I can reproduce it in #1090. Merging.