[PR #9844/fabf3884 backport][3.10] Fix compressed get request benchmark payload length

[patchback]

This is a backport of PR #9844 as merged into master (fabf388).

The payload length was much smaller than expected because zlib more efficient than expected and previous testing to calculate the payload size was incorrect

[codspeed-hq]

CodSpeed Performance Report

Merging #9845 will not alter performance

_{Comparing patchback/backports/3.10/fabf3884d645ff923214293485f9c2204d03e0c2/pr-9844 (6c76845) with 3.10 (68a1f42)}

Summary

✅ 23 untouched benchmarks

🆕 1 new benchmarks
⁉️ 1 (👁 1) dropped benchmarks

Benchmarks breakdown

	Benchmark	3.10	patchback/backports/3.10/fabf3884d645ff923214293485f9c2204d03e0c2/pr-9844	Change
👁	test_five_get_requests_with_567296_compressed_chunked_payload[pyloop]	122.3 ms	N/A	N/A
🆕	test_get_request_with_251308_compressed_chunked_payload[pyloop]	N/A	465 ms	N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.92%. Comparing base (68a1f42) to head (6c76845).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #9845      +/-   ##
==========================================
- Coverage   97.92%   97.92%   -0.01%     
==========================================
  Files         113      113              
  Lines       35839    35837       -2     
  Branches     4316     4316              
==========================================
- Hits        35095    35092       -3     
  Misses        553      553              
- Partials      191      192       +1     

Flag	Coverage Δ
CI-GHA	97.81% <100.00%> (-0.01%)	⬇️
OS-Linux	97.51% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.11% <100.00%> (-0.01%)	⬇️
OS-macOS	97.20% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.06% <100.00%> (-0.01%)	⬇️
Py-3.10.15	97.01% <100.00%> (-0.04%)	⬇️
Py-3.11.10	97.08% <100.00%> (-0.01%)	⬇️
Py-3.11.9	97.15% <100.00%> (-0.01%)	⬇️
Py-3.12.7	97.58% <100.00%> (-0.01%)	⬇️
Py-3.13.0	97.57% <100.00%> (-0.01%)	⬇️
Py-3.8.10	94.51% <100.00%> (-0.01%)	⬇️
Py-3.8.18	96.85% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.98% <100.00%> (-0.01%)	⬇️
Py-3.9.20	96.97% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	96.53% <100.00%> (-0.01%)	⬇️
VM-macos	97.20% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.51% <100.00%> (+<0.01%)	⬆️
VM-windows	95.11% <100.00%> (-0.01%)	⬇️

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