fix(pyspark): Grab attemptId more defensively

[sentrivana]

Closes #1099

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.62%. Comparing base (a97c53c) to head (7e0e2e2).
Report is 3 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/spark/spark_driver.py	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4130      +/-   ##
==========================================
+ Coverage   79.53%   79.62%   +0.08%     
==========================================
  Files         140      140              
  Lines       15594    15610      +16     
  Branches     2647     2649       +2     
==========================================
+ Hits        12403    12429      +26     
+ Misses       2351     2342       -9     
+ Partials      840      839       -1     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/spark/spark_driver.py	64.11% <94.44%> (+3.07%)	⬆️

... and 5 files with indirect coverage changes

[antonpirker]

nice!