Restore zero copy writes on Python 3.12.9+/3.13.2+

[bdraco]

TODO

• Hold until 3.13.2 release day: Tuesday, 2025-02-04
• Wait for GitHub to update 3.13 runners to 3.13.2
• Re-run benchmarks
• If benchmarks show the perf regression is fixed, this should be good to move forward and do a new release

What do these changes do?

Restore zero copy support on Python 3.12.9+/3.13.2+ (unreleased at this time)
CVE-2024-12254 aka GHSA-fw89-6wjj-8j95 is fixed on these Python versions

Are there changes in behavior for the user?

The performance regression introduced by disabling zero copy writes in #10125 will be resolved

The relevant benchmarks (keep in mind we are benchmarking disabling zero copy writes), and this PR seeks to restore the performance:

test_one_hundred_get_requests_with_1024_chunked_payload +3% (writelines is a bit worse for tiny payloads)
test_one_hundred_get_requests_with_512kib_chunked_payload -21% (writelines is a lot better for large payloads)
test_one_hundred_get_requests_with_30000_chunked_payload -4% (writelines is a slightly better for medium size payloads)

Since we already have to branch here, I also added MIN_PAYLOAD_FOR_WRITELINES to 2048 to ensure we no longer take the 3% performance hit for writelines with small payloads

[codspeed-hq]

CodSpeed Performance Report

Merging #10137 will not alter performance

_{Comparing restore_zero_copy (85b21f7) with master (dbd77ad)}

Summary

✅ 47 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.75%. Comparing base (dbd77ad) to head (85b21f7).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10137      +/-   ##
==========================================
+ Coverage   97.18%   98.75%   +1.56%     
==========================================
  Files         120      122       +2     
  Lines       36888    37031     +143     
  Branches     4301     4432     +131     
==========================================
+ Hits        35851    36571     +720     
+ Misses        824      313     -511     
+ Partials      213      147      -66     

Flag	Coverage Δ
CI-GHA	98.64% <100.00%> (+1.45%)	⬆️
OS-Linux	98.33% <100.00%> (?)
OS-Windows	96.18% <100.00%> (?)
OS-macOS	97.44% <100.00%> (+0.25%)	⬆️
Py-3.10.11	97.28% <100.00%> (?)
Py-3.10.15	97.82% <100.00%> (?)
Py-3.11.10	97.86% <100.00%> (?)
Py-3.11.9	97.32% <100.00%> (?)
Py-3.12.7	98.39% <100.00%> (?)
Py-3.13.0	97.19% <100.00%> (+0.01%)	⬆️
Py-3.13.1	98.34% <100.00%> (?)
Py-3.9.13	97.20% <100.00%> (?)
Py-3.9.20	97.78% <100.00%> (?)
Py-pypy7.3.16	97.35% <100.00%> (?)
VM-macos	97.44% <100.00%> (+0.25%)	⬆️
VM-ubuntu	98.33% <100.00%> (?)
VM-windows	96.18% <100.00%> (?)

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