[PR #5928/a341986d backport][3.8] fix: remove deprecated loop argument for asnycio.sleep/gather calls

[patchback]

This is a backport of PR #5928 as merged into master (a341986).

What do these changes do?

Remove deprecated loop argument for asnycio.sleep and asyncio.gather calls.

Are there changes in behavior for the user?

No.

Related issue number

Closes #5905 .

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov]

Codecov Report

Merging #5929 (a341986) into 3.8 (66e281f) will decrease coverage by 0.77%.
The diff coverage is 96.31%.

❗ Current head a341986 differs from pull request most recent head 7dc0d4f. Consider uploading reports for the commit 7dc0d4f to get more accurate results

@@            Coverage Diff             @@
##              3.8    #5929      +/-   ##
==========================================
- Coverage   97.52%   96.75%   -0.78%     
==========================================
  Files          44       44              
  Lines        8865     9852     +987     
  Branches     1429     1591     +162     
==========================================
+ Hits         8646     9532     +886     
- Misses        103      182      +79     
- Partials      116      138      +22     

Flag	Coverage Δ
unit	96.65% <96.08%> (-0.70%)	⬇️

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

Impacted Files	Coverage Δ
aiohttp/web_middlewares.py	100.00% <ø> (ø)
aiohttp/web_protocol.py	86.41% <ø> (-4.20%)	⬇️
aiohttp/web_request.py	95.99% <ø> (-1.57%)	⬇️
aiohttp/web_response.py	98.21% <ø> (-0.06%)	⬇️
aiohttp/web_routedef.py	98.11% <ø> (+0.01%)	⬆️
aiohttp/web_runner.py	97.74% <ø> (+0.11%)	⬆️
aiohttp/web_server.py	94.28% <ø> (-5.72%)	⬇️
aiohttp/web_urldispatcher.py	97.83% <ø> (+0.23%)	⬆️
aiohttp/web_ws.py	91.53% <ø> (ø)
aiohttp/worker.py	94.91% <ø> (-1.81%)	⬇️
... and 75 more

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