Fix CONNECT always being treated as having an empty body (#7772)

[bdraco]

(cherry picked from commit af2bb1e)

[codecov]

Codecov Report

Merging #7774 (b940aeb) into 3.9 (5e62fee) will increase coverage by 0.00%.
Report is 1 commits behind head on 3.9.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              3.9    #7774   +/-   ##
=======================================
  Coverage   97.31%   97.31%           
=======================================
  Files         107      107           
  Lines       32002    32005    +3     
  Branches     3735     3735           
=======================================
+ Hits        31142    31145    +3     
  Misses        654      654           
  Partials      206      206           

Flag	Coverage Δ
CI-GHA	97.22% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.91% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.43% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.56% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	94.35% <100.00%> (+<0.01%)	⬆️
Py-3.10.13	96.75% <100.00%> (+<0.01%)	⬆️
Py-3.11.6	96.44% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.32% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.68% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	94.32% <100.00%> (+<0.01%)	⬆️
Py-3.9.18	96.72% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	96.11% <100.00%> (+<0.01%)	⬆️
VM-macos	96.56% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	96.91% <100.00%> (+<0.01%)	⬆️
VM-windows	94.43% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
aiohttp/helpers.py	95.16% <100.00%> (ø)
tests/test_helpers.py	98.87% <100.00%> (+<0.01%)	⬆️

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