CI: set pytest asyncio_default_fixture_loop_scope

[superlopuh]

Removes the following error:

PytestDeprecationWarning: The configuration option "asyncio_default_fixture_loop_scope" is unset.
The event loop scope for asynchronous fixtures will default to the fixture caching scope. Future versions of pytest-asyncio will default the loop scope for asynchronous fixtures to function scope. Set the default fixture loop scope explicitly in order to avoid unexpected behavior in the future. Valid fixture loop scopes are: "function", "class", "module", "package", "session"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.30%. Comparing base (0dd5626) to head (58e3ff7).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3935   +/-   ##
=======================================
  Coverage   91.30%   91.30%           
=======================================
  Files         467      467           
  Lines       58068    58068           
  Branches     5581     5581           
=======================================
+ Hits        53018    53021    +3     
+ Misses       3618     3616    -2     
+ Partials     1432     1431    -1     

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