[PR #9911/4441d3c8 backport][3.12] Only construct the allowed_methods set once for a StaticResource

[patchback]

This is a backport of PR #9911 as merged into master (4441d3c).

noticed in #9899 (comment)

Likely to have minimal performance improvement besides saving some memory churn so I didn't call it in out the changelog

[codspeed-hq]

CodSpeed Performance Report

Merging #9913 will not alter performance

_{Comparing patchback/backports/3.12/4441d3c84b7cc03e1ab566faf8b6c9de4fa3c0ff/pr-9911 (a4ce831) with 3.12 (4838f40)}

Summary

✅ 26 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.00%. Comparing base (4838f40) to head (a4ce831).
Report is 1 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.12    #9913   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files         120      120           
  Lines       36474    36475    +1     
  Branches     4370     4370           
=======================================
+ Hits        35745    35746    +1     
  Misses        545      545           
  Partials      184      184           

Flag	Coverage Δ
CI-GHA	97.89% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.59% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.45% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.69% <100.00%> (-0.01%)	⬇️
Py-3.10.11	96.54% <100.00%> (-0.01%)	⬇️
Py-3.10.15	97.09% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.16% <100.00%> (-0.05%)	⬇️
Py-3.11.9	96.62% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	97.65% <100.00%> (-0.01%)	⬇️
Py-3.13.0	97.65% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.47% <100.00%> (-0.01%)	⬇️
Py-3.9.20	97.06% <100.00%> (+0.03%)	⬆️
Py-pypy7.3.16	96.62% <100.00%> (+<0.01%)	⬆️
VM-macos	96.69% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.59% <100.00%> (+<0.01%)	⬆️
VM-windows	94.45% <100.00%> (+<0.01%)	⬆️

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