Remove sphinxcontrib-asyncio (#7439)

[Dreamsorcerer]

I don't this is needed anymore, and may be causing issues with newer sphinx releases.

(cherry picked from commit c6217be)

[codecov]

Codecov Report

Merging #7440 (b7c2f8d) into 3.9 (c5432b3) will increase coverage by 0.02%.
Report is 101 commits behind head on 3.9.
The diff coverage is 96.85%.

@@            Coverage Diff             @@
##              3.9    #7440      +/-   ##
==========================================
+ Coverage   97.25%   97.28%   +0.02%     
==========================================
  Files         103      107       +4     
  Lines       30183    31617    +1434     
  Branches     3738     3655      -83     
==========================================
+ Hits        29354    30758    +1404     
- Misses        633      653      +20     
- Partials      196      206      +10     

Flag	Coverage Δ
CI-GHA	97.22% <96.66%> (+0.07%)	⬆️
OS-Linux	96.91% <96.37%> (+0.10%)	⬆️
OS-Windows	94.53% <92.06%> (+0.38%)	⬆️
OS-macOS	96.58% <94.94%> (+0.10%)	⬆️
Py-3.10.11	94.44% <91.86%> (?)
Py-3.10.12	96.78% <96.09%> (?)
Py-3.10.7	?
Py-3.11.0-rc.2	?
Py-3.11.4	96.52% <95.61%> (?)
Py-3.7.14	?
Py-3.8.10	94.41% <91.95%> (?)
Py-3.8.14	?
Py-3.8.17	96.72% <96.18%> (?)
Py-3.9.13	94.42% <91.95%> (?)
Py-3.9.14	?
Py-3.9.17	96.76% <96.18%> (?)
Py-pypy7.3.11	96.31% <94.08%> (?)
VM-macos	96.58% <94.94%> (+0.10%)	⬆️
VM-ubuntu	96.91% <96.37%> (+0.10%)	⬆️
VM-windows	94.53% <92.06%> (+0.38%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
aiohttp/typedefs.py	100.00% <ø> (ø)
aiohttp/web_request.py	97.24% <ø> (-0.46%)	⬇️
tests/test_loop.py	94.44% <ø> (-5.56%)	⬇️
tests/test_pytest_plugin.py	100.00% <ø> (ø)
tests/test_web_middleware.py	98.12% <ø> (ø)
tests/test_web_response.py	99.51% <ø> (-0.01%)	⬇️
tests/test_web_runner.py	100.00% <ø> (ø)
aiohttp/connector.py	92.53% <69.23%> (+0.13%)	⬆️
aiohttp/compression_utils.py	84.61% <84.61%> (ø)
aiohttp/client.py	94.47% <85.71%> (ø)
... and 59 more

... and 4 files with indirect coverage changes

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