Require asgiref>=3.6.0

[Viicos]

django-axes is making use of some functions added in asgiref==3.6.0, but Django 3.2 requires asgiref>=3.3.2.

What does this PR do?

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.79%. Comparing base (fd9d185) to head (61c6dd9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1188   +/-   ##
=======================================
  Coverage   93.79%   93.79%           
=======================================
  Files          35       35           
  Lines        1161     1161           
  Branches      215      215           
=======================================
  Hits         1089     1089           
  Misses         54       54           
  Partials       18       18           

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[aleksihakli]

Thank you @Viicos!