[PR #8597/c99a1e27 backport][3.11] Fix reading of body when ignoring an upgrade request

[patchback]

This is a backport of PR #8597 as merged into master (c99a1e2).

Fixes #8414.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.57%. Comparing base (6e6fe0e) to head (b5aff6e).
Report is 540 commits behind head on 3.11.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11    #8630      +/-   ##
==========================================
- Coverage   97.59%   97.57%   -0.02%     
==========================================
  Files         108      108              
  Lines       33675    33684       +9     
  Branches     4039     4038       -1     
==========================================
+ Hits        32865    32868       +3     
- Misses        590      593       +3     
- Partials      220      223       +3     

Flag	Coverage Δ
CI-GHA	97.48% <100.00%> (-0.02%)	⬇️
OS-Linux	97.15% <100.00%> (-0.02%)	⬇️
OS-Windows	94.70% <100.00%> (-0.01%)	⬇️
OS-macOS	96.83% <100.00%> (-0.01%)	⬇️
Py-3.10.11	96.93% <100.00%> (-0.01%)	⬇️
Py-3.10.14	96.88% <100.00%> (-0.02%)	⬇️
Py-3.11.9	97.11% <100.00%> (-0.02%)	⬇️
Py-3.12.4	97.22% <100.00%> (-0.02%)	⬇️
Py-3.8.10	94.43% <100.00%> (-0.01%)	⬇️
Py-3.8.18	96.78% <100.00%> (-0.02%)	⬇️
Py-3.9.13	96.94% <100.00%> (-0.01%)	⬇️
Py-3.9.19	96.89% <100.00%> (-0.02%)	⬇️
Py-pypy7.3.16	96.47% <100.00%> (+<0.01%)	⬆️
VM-macos	96.83% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.15% <100.00%> (-0.02%)	⬇️
VM-windows	94.70% <100.00%> (-0.01%)	⬇️

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