Fix CI, adapt to new redis-py release

[sentrivana]

Three new versions of things that need addressing:

• pytest-asyncio 1.0 removes the deprecated event_loop fixture
• mypy 1.16.0 finds some new issues
• redis 6.2.0:
  • adds the execution_strategy abstraction to async cluster pipelines as well, so the commands are no longer accessible directly and need to be accessed via the strategy
  • renames the _client attribute on async cluster pipeline to cluster_client

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.67%. Comparing base (385c668) to head (3d45ded).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/django/asgi.py	50.00%	1 Missing ⚠️
sentry_sdk/integrations/tornado.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4431      +/-   ##
==========================================
+ Coverage   80.61%   80.67%   +0.05%     
==========================================
  Files         142      142              
  Lines       15973    15982       +9     
  Branches     2727     2729       +2     
==========================================
+ Hits        12877    12893      +16     
+ Misses       2240     2233       -7     
  Partials      856      856              

Files with missing lines	Coverage Δ
sentry_sdk/integrations/redis/_async_common.py	83.92% <100.00%> (+1.92%)	⬆️
sentry_sdk/integrations/redis/redis_cluster.py	82.05% <100.00%> (+1.49%)	⬆️
sentry_sdk/integrations/django/asgi.py	78.07% <50.00%> (ø)
sentry_sdk/integrations/tornado.py	80.53% <0.00%> (ø)

... and 4 files with indirect coverage changes

[sentrivana]

mypy was complaining because of environment and release potentially being None here

[sentrivana]

redis-py PR that introduced this

[sentrivana]

redis-py PR that introduced this

[antonpirker]

lookin' good. thanks for fixing!