add manylinux_aarch64 wheels to CI

[oscarhiggott]

For #67

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a58fe36) to head (b0f8989).
Report is 25 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master       #66   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          331       331           
=========================================
  Hits           331       331           

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