Fix flakey test_uvloop_secure_https_proxy test

[bdraco]

This is another attempt to fix this flakey test. Sadly it only fails in the CI, and only sometimes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.75%. Comparing base (4624fed) to head (6f18f7e).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10907      +/-   ##
==========================================
+ Coverage   97.58%   98.75%   +1.17%     
==========================================
  Files         127      129       +2     
  Lines       39031    39099      +68     
  Branches     2155     2166      +11     
==========================================
+ Hits        38088    38613     +525     
+ Misses        776      337     -439     
+ Partials      167      149      -18     

Flag	Coverage Δ
CI-GHA	98.64% <100.00%> (+1.14%)	⬆️
OS-Linux	98.35% <100.00%> (?)
OS-Windows	96.50% <0.00%> (?)
OS-macOS	97.50% <100.00%> (+0.01%)	⬆️
Py-3.10.11	97.39% <100.00%> (?)
Py-3.10.17	97.92% <100.00%> (?)
Py-3.11.12	98.00% <100.00%> (?)
Py-3.11.9	97.47% <100.00%> (+0.30%)	⬆️
Py-3.12.10	98.42% <100.00%> (+1.13%)	⬆️
Py-3.13.3	98.40% <100.00%> (+1.11%)	⬆️
Py-3.9.13	97.26% <100.00%> (+0.29%)	⬆️
Py-3.9.22	97.79% <100.00%> (?)
Py-pypy7.3.16	86.55% <0.00%> (?)
VM-macos	97.50% <100.00%> (+0.01%)	⬆️
VM-ubuntu	98.35% <100.00%> (?)
VM-windows	96.50% <0.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #10907 will not alter performance

_{Comparing uvloop_proxy_test (6f18f7e) with master (4624fed)}

Summary

✅ 60 untouched benchmarks

[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/b25eca0144e618a91b78c3b0f348503db2510657/pr-10907

Backported as #10908

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.12: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.12/b25eca0144e618a91b78c3b0f348503db2510657/pr-10907

Backported as #10909

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.