Avoid deprecation warning from pytest-asyncio

[berland]

This deprecation warning pops up from pytest-asyncio==0.24

Issue
Resolves warning from pytest runs:

/tmp/f_scout_ci/actions-runner-06/_temp/test-kenv/root/lib64/python3.8/site-packages/pytest_asyncio/plugin.py:208: 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"

Approach
Read pytest-dev/pytest-asyncio#924

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure tests pass locally (after every commit!)

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.86%. Comparing base (d71be2a) to head (3b8ebf2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8629   +/-   ##
=======================================
  Coverage   90.86%   90.86%           
=======================================
  Files         339      339           
  Lines       20866    20881   +15     
=======================================
+ Hits        18959    18973   +14     
- Misses       1907     1908    +1     

Flag	Coverage Δ
gui-tests	75.73% <ø> (-0.03%)	⬇️
integration-tests	53.79% <ø> (+0.04%)	⬆️
unit-tests	68.67% <ø> (-0.03%)	⬇️

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[eivindjahren]

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