Fix usage of proxy.py in test_proxy_functional (#7773)

[bdraco]

(cherry picked from commit 4d9fc63)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5fa260a) 97.24% compared to head (0816f20) 97.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##              3.9    #7876      +/-   ##
==========================================
+ Coverage   97.24%   97.34%   +0.09%     
==========================================
  Files         108      108              
  Lines       32407    32402       -5     
  Branches     3843     3842       -1     
==========================================
+ Hits        31515    31542      +27     
+ Misses        681      655      -26     
+ Partials      211      205       -6     

Flag	Coverage Δ
CI-GHA	97.25% <100.00%> (+0.08%)	⬆️
OS-Linux	96.94% <100.00%> (+0.07%)	⬆️
OS-Windows	94.43% <100.00%> (+0.03%)	⬆️
OS-macOS	96.75% <100.00%> (?)
Py-3.10.11	94.34% <100.00%> (?)
Py-3.10.13	96.72% <100.00%> (+0.03%)	⬆️
Py-3.11.6	96.45% <100.00%> (-0.01%)	⬇️
Py-3.12.0	96.38% <100.00%> (?)
Py-3.8.10	94.31% <100.00%> (?)
Py-3.8.18	96.65% <100.00%> (-0.06%)	⬇️
Py-3.9.13	94.32% <100.00%> (-0.08%)	⬇️
Py-3.9.18	96.70% <100.00%> (-0.02%)	⬇️
Py-pypy7.3.13	96.16% <100.00%> (?)
VM-macos	96.75% <100.00%> (?)
VM-ubuntu	96.94% <100.00%> (+0.07%)	⬆️
VM-windows	94.43% <100.00%> (+0.03%)	⬆️

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