Fix custom cookies example (#9321)

[Dreamsorcerer]

(cherry picked from commit a4b148e)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.79%. Comparing base (609c6e3) to head (c703174).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9324   +/-   ##
=======================================
  Coverage   97.79%   97.79%           
=======================================
  Files         108      108           
  Lines       34842    34842           
  Branches     4163     4163           
=======================================
  Hits        34072    34072           
  Misses        573      573           
  Partials      197      197           

Flag	Coverage Δ
CI-GHA	97.68% <ø> (ø)
OS-Linux	97.36% <ø> (ø)
OS-Windows	94.97% <ø> (ø)
OS-macOS	97.06% <ø> (ø)
Py-3.10.11	97.02% <ø> (-0.01%)	⬇️
Py-3.10.15	96.96% <ø> (ø)
Py-3.11.10	96.94% <ø> (ø)
Py-3.11.9	97.02% <ø> (+<0.01%)	⬆️
Py-3.12.6	97.41% <ø> (ø)
Py-3.13.0-rc.2	97.39% <ø> (ø)
Py-3.8.10	94.47% <ø> (ø)
Py-3.8.18	96.76% <ø> (ø)
Py-3.9.13	96.94% <ø> (ø)
Py-3.9.20	96.88% <ø> (ø)
Py-pypy7.3.16	96.48% <ø> (+<0.01%)	⬆️
VM-macos	97.06% <ø> (ø)
VM-ubuntu	97.36% <ø> (ø)
VM-windows	94.97% <ø> (ø)

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