Treat django.template.context.BasicContext as sequence in serializer

[sl0thentr0py]

closes #4606

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.69%. Comparing base (add8b6f) to head (039a1f5).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/django/__init__.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4621      +/-   ##
==========================================
+ Coverage   80.64%   80.69%   +0.04%     
==========================================
  Files         156      156              
  Lines       16500    16510      +10     
  Branches     2806     2806              
==========================================
+ Hits        13307    13322      +15     
+ Misses       2304     2298       -6     
- Partials      889      890       +1     

Files with missing lines	Coverage Δ
sentry_sdk/serializer.py	90.62% <100.00%> (+0.14%)	⬆️
sentry_sdk/integrations/django/__init__.py	81.81% <75.00%> (+0.33%)	⬆️

... and 5 files with indirect coverage changes