[PR #9780/eac8fb84 backport][3.11] Replace get_event_loop with get_running_loop in the compressor

[patchback]

This is a backport of PR #9780 as merged into master (eac8fb8).

What do these changes do?

Replace get_event_loop with get_running_loop in the compressor. This should never be called without a running event loop as its in an async function.

asyncio.get_event_loop:

Deprecated since version 3.12: Deprecation warning is emitted if there is no current event loop. In some future Python release this will become an error

There was no need to call the sync wrapper function since we are already inside the object and can call the compressor/decompressor directly.

Adds missing test coverage

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

[codspeed-hq]

CodSpeed Performance Report

Merging #9789 will not alter performance

_{Comparing patchback/backports/3.11/eac8fb84417fd55128e2263f60ef3efa6ba51abd/pr-9780 (7241f4f) with 3.11 (e499d55)}

Summary

✅ 15 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.96%. Comparing base (e499d55) to head (7241f4f).
Report is 2 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11    #9789      +/-   ##
==========================================
+ Coverage   97.49%   97.96%   +0.47%     
==========================================
  Files         117      118       +1     
  Lines       36029    36049      +20     
  Branches     4321     4331      +10     
==========================================
+ Hits        35126    35317     +191     
+ Misses        690      546     -144     
+ Partials      213      186      -27     

Flag	Coverage Δ
CI-GHA	97.85% <100.00%> (+0.43%)	⬆️
OS-Linux	97.55% <100.00%> (+0.20%)	⬆️
OS-Windows	94.50% <100.00%> (?)
OS-macOS	96.77% <100.00%> (+0.10%)	⬆️
Py-3.10.11	96.62% <100.00%> (+0.30%)	⬆️
Py-3.10.15	97.05% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.17% <100.00%> (+0.05%)	⬆️
Py-3.11.9	96.69% <100.00%> (+0.29%)	⬆️
Py-3.12.7	97.62% <100.00%> (+1.07%)	⬆️
Py-3.13.0	97.61% <100.00%> (+1.06%)	⬆️
Py-3.9.13	96.55% <100.00%> (?)
Py-3.9.20	96.98% <100.00%> (?)
Py-pypy7.3.16	96.59% <100.00%> (?)
VM-macos	96.77% <100.00%> (+0.10%)	⬆️
VM-ubuntu	97.55% <100.00%> (+0.20%)	⬆️
VM-windows	94.50% <100.00%> (?)

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