Update mypy version to 1.7.1

[LacombeLouis]

Description

Fixing an issue with mypy. #398

Type of change

Please remove options that are irrelevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read the contributing guidelines
• I have updated the HISTORY.rst and AUTHORS.rst files
• Linting passes successfully : make lint
• Typing passes successfully : make type-check
• Unit tests pass successfully : make tests
• Coverage is 100% : make coverage
• Documentation builds successfully : make doc

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (614293e) 100.00% compared to head (c240f85) 100.00%.
Report is 173 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##            master      #399    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           39        39            
  Lines         4616      4772   +156     
  Branches       487       792   +305     
==========================================
+ Hits          4616      4772   +156     

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[thibaultcordier]

Super, this update of mypy version in the requirements is very welcome!