Pass proxy argument to axon postfiles in _httpRequest (SYN-5192)

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -1.92 ⚠️

Comparison is base (01a8686) 97.27% compared to head (1470385) 95.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3109      +/-   ##
==========================================
- Coverage   97.27%   95.36%   -1.92%     
==========================================
  Files         222      222              
  Lines       44057    44057              
==========================================
- Hits        42857    42013     -844     
- Misses       1200     2044     +844     

Flag	Coverage Δ
linux	95.36% <100.00%> (-1.82%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/stormhttp.py	97.67% <100.00%> (-2.33%)	⬇️

... and 22 files with indirect coverage changes

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