Remove deprecated content_transfer_encoding

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (88c80c1) to head (40f878a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8303      +/-   ##
==========================================
+ Coverage   97.47%   97.55%   +0.07%     
==========================================
  Files         107      107              
  Lines       33024    33015       -9     
  Branches     3872     3869       -3     
==========================================
+ Hits        32191    32207      +16     
+ Misses        609      589      -20     
+ Partials      224      219       -5     

Flag	Coverage Δ
CI-GHA	97.46% <100.00%> (+0.06%)	⬆️
OS-Linux	97.13% <100.00%> (+0.06%)	⬆️
OS-Windows	95.62% <100.00%> (+0.06%)	⬆️
OS-macOS	96.84% <100.00%> (+0.01%)	⬆️
Py-3.10.11	95.47% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	96.93% <100.00%> (+0.03%)	⬆️
Py-3.11.8	97.13% <100.00%> (+0.03%)	⬆️
Py-3.12.2	97.25% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	95.39% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.78% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	95.44% <100.00%> (?)
Py-3.9.19	96.91% <100.00%> (+0.11%)	⬆️
Py-pypy7.3.15	96.44% <100.00%> (?)
VM-macos	96.84% <100.00%> (+0.01%)	⬆️
VM-ubuntu	97.13% <100.00%> (+0.06%)	⬆️
VM-windows	95.62% <100.00%> (+0.06%)	⬆️

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