add renewal_triggered_by parameter to payment.set_renew_token

[radekholy24]

Enables migration to django-getpaid/django-plans#188

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.76%. Comparing base (1f61405) to head (91e2f32).
Report is 3 commits behind head on master.

❗ Current head 91e2f32 differs from pull request most recent head d989f4e. Consider uploading reports for the commit d989f4e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   90.56%   90.76%   +0.19%     
==========================================
  Files           2        2              
  Lines         371      379       +8     
  Branches       58       60       +2     
==========================================
+ Hits          336      344       +8     
  Misses         15       15              
  Partials       20       20              

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