DNM: Experiment to speed up creating cookie morsels

[bdraco]

This likely needs to be optimized upstream but we can get an idea if its worth it here

[codspeed-hq]

CodSpeed Performance Report

Merging #9594 will improve performances by 12.91%

_{Comparing fast_morsel (8de6833) with master (7d0f980)}

Summary

⚡ 1 improvements
✅ 6 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	fast_morsel	Change
⚡	test_load_cookies_into_temp_cookiejar	210.4 µs	186.4 µs	+12.91%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (e23e036) to head (8de6833).
Report is 3 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9594   +/-   ##
=======================================
  Coverage   98.62%   98.62%           
=======================================
  Files         113      113           
  Lines       35284    35305   +21     
  Branches     4187     4189    +2     
=======================================
+ Hits        34799    34820   +21     
  Misses        325      325           
  Partials      160      160           

Flag	Coverage Δ
CI-GHA	98.51% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.18% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.08% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.40% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.26% <100.00%> (+0.01%)	⬆️
Py-3.10.15	97.66% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.72% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	95.70% <100.00%> (-1.64%)	⬇️
Py-3.12.7	98.19% <100.00%> (-0.03%)	⬇️
Py-3.13.0	98.20% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.16% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	97.57% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	97.18% <100.00%> (-0.01%)	⬇️
VM-macos	97.40% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.18% <100.00%> (+<0.01%)	⬆️
VM-windows	96.08% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[bdraco]

It's a really simple optimization. The loop can be replaced with a dict update upstream.