Switch all deprecation warnings to the warnings Python module.

[antonpirker]

Fixes #4109

[codecov]

Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Project coverage is 79.53%. Comparing base (0d23b72) to head (047db79).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/tracing.py	0.00%	3 Missing ⚠️
sentry_sdk/hub.py	33.33%	2 Missing ⚠️
sentry_sdk/scope.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4110      +/-   ##
==========================================
- Coverage   79.60%   79.53%   -0.08%     
==========================================
  Files         140      140              
  Lines       15581    15582       +1     
  Branches     2643     2643              
==========================================
- Hits        12404    12393      -11     
- Misses       2338     2355      +17     
+ Partials      839      834       -5     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/threading.py	87.50% <100.00%> (+0.19%)	⬆️
sentry_sdk/profiler/transaction_profiler.py	82.18% <100.00%> (-1.73%)	⬇️
sentry_sdk/scope.py	85.57% <66.66%> (ø)
sentry_sdk/hub.py	56.94% <33.33%> (ø)
sentry_sdk/tracing.py	77.53% <0.00%> (-0.21%)	⬇️

... and 5 files with indirect coverage changes