Update numpy to >=1.20.0

[bhancock8]

Description of proposed changes

Update numpy to resolve incompatibility with spacy, resulting in the following error message and failing CI tests on master:

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

Test plan

Unit tests fail previously, confirm they pass after this update

Checklist

Need help on these? Just ask!

• [x] I have read the CONTRIBUTING document.
• [x] I have updated the documentation accordingly.
• [N/A] I have added tests to cover my changes.
• [x] I have run tox -e complex and/or tox -e spark if appropriate.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #1653 (f5a64c7) into master (39dc1c4) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1653   +/-   ##
=======================================
  Coverage   97.31%   97.32%           
=======================================
  Files          68       68           
  Lines        2163     2165    +2     
  Branches      350      351    +1     
=======================================
+ Hits         2105     2107    +2     
  Misses         30       30           
  Partials       28       28           

Impacted Files	Coverage Δ
snorkel/labeling/model/label_model.py	96.40% <100.00%> (+0.02%)	:arrow_up:

[github-actions[bot]]

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