Update numpy version to avoid error

[beat-buesser]

Signed-off-by: Beat Buesser beat.buesser@ie.ibm.com

Description

This pull request increases Numpy version for CI to 1.20.0 to avoid:

ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject

that started appearing yesterday as discussed in this and similar threads scikit-learn-contrib/hdbscan#457

Type of change

Please check all relevant options.

• Improvement (non-breaking)
• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[codecov-io]

Codecov Report

Merging #879 (0a6e363) into dev_1.5.2 (1b2980f) will decrease coverage by 24.77%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           dev_1.5.2     #879       +/-   ##
==============================================
- Coverage      64.59%   39.81%   -24.78%     
==============================================
  Files            176      176               
  Lines          17147    17147               
  Branches        3176     3176               
==============================================
- Hits           11076     6827     -4249     
- Misses          4820     9539     +4719     
+ Partials        1251      781      -470     

Impacted Files	Coverage Δ
...rt/defences/detector/poison/clustering_analyzer.py	8.22% <0.00%> (-86.71%)	⬇️
...ces/detector/evasion/subsetscanning/scanningops.py	11.59% <0.00%> (-85.51%)	⬇️
art/attacks/evasion/carlini.py	8.40% <0.00%> (-80.87%)	⬇️
...ient_descent/projected_gradient_descent_pytorch.py	16.93% <0.00%> (-78.23%)	⬇️
art/metrics/verification_decisions_trees.py	13.75% <0.00%> (-73.02%)	⬇️
art/attacks/evasion/decision_tree_attack.py	22.66% <0.00%> (-69.34%)	⬇️
art/attacks/evasion/elastic_net.py	17.64% <0.00%> (-68.63%)	⬇️
art/defences/detector/poison/activation_defence.py	15.71% <0.00%> (-68.57%)	⬇️
art/defences/detector/poison/roni.py	24.05% <0.00%> (-68.36%)	⬇️
art/attacks/poisoning/poisoning_attack_svm.py	15.96% <0.00%> (-68.07%)	⬇️
... and 73 more