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

[bdraco]

(cherry picked from commit 4d9fc63)

[bdraco]

still need to test locally before undrafting

[bdraco]

Results (4.59s):
19 passed
3 skipped

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3c63ca0) 97.34% compared to head (ee451da) 97.34%.
Report is 1 commits behind head on 3.10.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #7877   +/-   ##
=======================================
  Coverage   97.34%   97.34%           
=======================================
  Files         108      108           
  Lines       32384    32402   +18     
  Branches     3839     3842    +3     
=======================================
+ Hits        31524    31542   +18     
  Misses        655      655           
  Partials      205      205           

Flag	Coverage Δ
CI-GHA	97.25% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.94% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.44% <100.00%> (-0.06%)	⬇️
OS-macOS	96.75% <100.00%> (+0.14%)	⬆️
Py-3.10.11	94.34% <100.00%> (-0.07%)	⬇️
Py-3.10.13	96.72% <100.00%> (-0.06%)	⬇️
Py-3.11.6	96.48% <100.00%> (+0.03%)	⬆️
Py-3.12.0	96.38% <100.00%> (?)
Py-3.8.10	94.31% <100.00%> (-0.07%)	⬇️
Py-3.8.18	96.65% <100.00%> (-0.06%)	⬇️
Py-3.9.13	94.33% <100.00%> (-0.06%)	⬇️
Py-3.9.18	96.70% <100.00%> (-0.06%)	⬇️
Py-pypy7.3.13	96.16% <100.00%> (-0.06%)	⬇️
VM-macos	96.75% <100.00%> (+0.14%)	⬆️
VM-ubuntu	96.94% <100.00%> (+<0.01%)	⬆️
VM-windows	94.44% <100.00%> (-0.06%)	⬇️

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