Remove DeprecationWarning by replace get_event_loop with get_running_loop

[dvora-h]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
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• Is there an example added to the examples folder (if applicable)?
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Description of change

closes #2525

[codecov-commenter]

Codecov Report

Base: 92.24% // Head: 92.21% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (57c4dc5) compared to base (74c251a).
Patch coverage: 94.73% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2530      +/-   ##
==========================================
- Coverage   92.24%   92.21%   -0.03%     
==========================================
  Files         113      113              
  Lines       29357    29375      +18     
==========================================
+ Hits        27079    27088       +9     
- Misses       2278     2287       +9     

Impacted Files	Coverage Δ
redis/asyncio/client.py	92.51% <0.00%> (ø)
redis/asyncio/connection.py	86.44% <100.00%> (-0.13%)	⬇️
redis/asyncio/lock.py	99.13% <100.00%> (ø)
tests/test_asyncio/test_connection_pool.py	99.40% <100.00%> (ø)
tests/test_asyncio/test_lock.py	100.00% <100.00%> (ø)
tests/test_asyncio/test_pubsub.py	99.53% <100.00%> (ø)
tests/test_cluster.py	96.79% <0.00%> (-0.34%)	⬇️
tests/test_asyncio/test_cluster.py	97.48% <0.00%> (-0.13%)	⬇️
tests/test_json.py	100.00% <0.00%> (ø)
... and 3 more

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