Fix threading run patch

[sl0thentr0py]

Since we're using current_thread for self explicitly, we need to remove the first argument from *a.

This actually doesn't matter since *a, **kw are both empty but since this is the way the patch is implemented (presumably for forward compat), I don't want to change the signature.

This fixes the following warning in CI since what actually happens is this:

• Thread.run is being patched at each Thread.start (and not just once as other patches do)
• So the current thread keeps getting accumulated in *a giving the TypeError for subsequent thread runs except the first

 TypeError: Thread.run() takes 1 positional argument but 5 were given

tests/integrations/redis/cluster_asyncio/test_redis_cluster_asyncio.py::test_async_span_origin
  /Users/neel/sentry/sdks/sentry-python/.tox/py3.12-redis-v5/lib/python3.12/site-packages/_pytest/threadexception.py:58: PytestUnhandledThreadExceptionWarning: Exception in thread sentry.monitor

closes #4361

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (7339704) to head (f738a8a).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4610      +/-   ##
==========================================
- Coverage   80.65%   80.63%   -0.03%     
==========================================
  Files         156      156              
  Lines       16500    16500              
  Branches     2806     2806              
==========================================
- Hits        13308    13304       -4     
- Misses       2304     2305       +1     
- Partials      888      891       +3     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/threading.py	89.33% <100.00%> (-1.34%)	⬇️

... and 3 files with indirect coverage changes