Fix usage of proxy.py in test_proxy_functional #1714

Job	Run time
Linter	1m 1s
Generate llhttp sources	5s
Test (3.8, ubuntu, false)	5m 3s
Test (3.8, windows, false)	4m 37s
Test (3.8, Y, ubuntu, false)	3m 56s
Test (3.9, ubuntu, false)	4m 26s
Test (3.9, macos, false)	6m 34s
Test (3.9, windows, false)	5m 59s
Test (3.9, Y, ubuntu, false)	5m 1s
Test (3.10, ubuntu, false)	4m 27s
Test (3.10, macos, false)	6m 50s
Test (3.10, windows, false)	5m 2s
Test (3.10, Y, ubuntu, false)	4m 20s
Test (pypy-3.9, Y, ubuntu, false)	9m 27s
Test (macos, 3.11, true, Y)	15m 2s
Test (ubuntu, 3.11, false, Y)	5m 6s
Test (windows, 3.11, true, Y)	13m 41s
Test (ubuntu, 3.12, true, Y)	4m 40s
Test (macos, 3.12, true, Y)	15m 35s
Test (windows, 3.12, true, Y)	16m 3s
check	3s
Pre-Deploy	0s
Tarball	0s
Build wheels on ${{ matrix.os }} ${{ matrix.qemu }}	0s
Deploy	0s
	2h 16m 58s

Provide feedback