Fix Response.text when body is Payload (#6485)

[Dreamsorcerer]

(cherry picked from commit 9418a4a)

[codecov]

Codecov Report

Attention: Patch coverage is 98.27586% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.72%. Comparing base (6c6d45b) to head (fbb1024).
Report is 208 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
aiohttp/payload_streamer.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8938   +/-   ##
=======================================
  Coverage   97.71%   97.72%           
=======================================
  Files         108      108           
  Lines       34238    34278   +40     
  Branches     4067     4073    +6     
=======================================
+ Hits        33456    33498   +42     
+ Misses        585      583    -2     
  Partials      197      197           

Flag	Coverage Δ
CI-GHA	97.61% <98.27%> (+<0.01%)	⬆️
OS-Linux	97.30% <98.27%> (+0.01%)	⬆️
OS-Windows	94.85% <98.27%> (+0.01%)	⬆️
OS-macOS	96.98% <98.27%> (+<0.01%)	⬆️
Py-3.10.11	97.07% <98.27%> (+<0.01%)	⬆️
Py-3.10.14	97.00% <98.27%> (+<0.01%)	⬆️
Py-3.11.9	97.23% <98.27%> (+<0.01%)	⬆️
Py-3.12.5	97.33% <98.27%> (+<0.01%)	⬆️
Py-3.8.10	94.49% <98.27%> (+0.01%)	⬆️
Py-3.8.18	96.81% <98.27%> (+<0.01%)	⬆️
Py-3.9.13	96.97% <98.27%> (+<0.01%)	⬆️
Py-3.9.19	96.91% <98.27%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.50% <98.27%> (+<0.01%)	⬆️
VM-macos	96.98% <98.27%> (+<0.01%)	⬆️
VM-ubuntu	97.30% <98.27%> (+0.01%)	⬆️
VM-windows	94.85% <98.27%> (+0.01%)	⬆️

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