Drop support for old frameworks

[sentrivana]

• trytond<5, falcon<3, django<2 are all more than 5 years old

Closes #4049

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.62%. Comparing base (445ebc9) to head (56bdf54).
Report is 2 commits behind head on potel-base.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff               @@
##           potel-base    #4246      +/-   ##
==============================================
+ Coverage       83.52%   83.62%   +0.09%     
==============================================
  Files             144      144              
  Lines           14723    14695      -28     
  Branches         2335     2330       -5     
==============================================
- Hits            12298    12288      -10     
+ Misses           1702     1690      -12     
+ Partials          723      717       -6     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/__init__.py	89.61% <ø> (+2.59%)	⬆️
sentry_sdk/integrations/django/__init__.py	85.02% <100.00%> (+1.37%)	⬆️
sentry_sdk/integrations/django/templates.py	56.70% <100.00%> (+1.36%)	⬆️
sentry_sdk/integrations/django/transactions.py	92.18% <100.00%> (-0.35%)	⬇️
sentry_sdk/integrations/falcon.py	91.30% <100.00%> (-0.57%)	⬇️
sentry_sdk/integrations/trytond.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[antonpirker]

yes, stuff like this always very satisfying :-)