Remove DeprecationWarning by replace get_event_loop with get_running_loop

[dvora-h]

Pull Request check-list

Please make sure to review and check all of these items:

• 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?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

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

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.