[PR #11634/cde03b9 backport][3.13] Fix blocking I/O to load netrc when creating requests

[bdraco]

(cherry picked from commit cde03b9)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.24%. Comparing base (6ce4f1d) to head (db9f7f2).
⚠️ Report is 3 commits behind head on 3.13.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.13   #11680   +/-   ##
=======================================
  Coverage   98.24%   98.24%           
=======================================
  Files         128      128           
  Lines       43764    43826   +62     
  Branches     2385     2385           
=======================================
+ Hits        42996    43058   +62     
  Misses        591      591           
  Partials      177      177           

Flag	Coverage Δ
CI-GHA	98.13% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.88% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.58% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.12% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.65% <100.00%> (+<0.01%)	⬆️
Py-3.10.18	97.15% <100.00%> (-0.01%)	⬇️
Py-3.11.13	97.21% <100.00%> (-0.14%)	⬇️
Py-3.11.14	96.67% <100.00%> (?)
Py-3.11.9	96.84% <100.00%> (+<0.01%)	⬆️
Py-3.12.10	96.93% <100.00%> (+<0.01%)	⬆️
Py-3.12.11	97.30% <100.00%> (-0.14%)	⬇️
Py-3.12.12	96.77% <100.00%> (?)
Py-3.13.7	97.67% <100.00%> (+0.01%)	⬆️
Py-3.14.0	97.65% <100.00%> (+<0.01%)	⬆️
Py-3.14.0t	96.73% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.55% <100.00%> (+<0.01%)	⬆️
Py-3.9.23	97.06% <100.00%> (+<0.01%)	⬆️
Py-pypy3.9.19-7.3.16	89.02% <100.00%> (-1.92%)	⬇️
VM-macos	97.12% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.88% <100.00%> (+<0.01%)	⬆️
VM-windows	95.58% <100.00%> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #11680 will not alter performance

_{Comparing patchback/backports/3.13/cde03b98c647272cf12f6e36cce35b5dc252171d/pr-11634 (db9f7f2) with 3.13 (6ce4f1d)}

Summary

✅ 59 untouched