fix run_app typing (#4957)

[derlih]

What do these changes do?

Fix typing of run_app function

Are there changes in behavior for the user?

No

Related issue number

#4957

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-io]

Codecov Report

Merging #5114 into master will decrease coverage by 0.43%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5114      +/-   ##
==========================================
- Coverage   97.50%   97.07%   -0.44%     
==========================================
  Files          43       43              
  Lines        8821     8822       +1     
  Branches     1414     1414              
==========================================
- Hits         8601     8564      -37     
- Misses        103      136      +33     
- Partials      117      122       +5     

Flag	Coverage Δ
#unit	97.07% <100.00%> (-0.44%)	⬇️

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

Impacted Files	Coverage Δ
aiohttp/web.py	97.45% <100.00%> (+0.02%)	⬆️
aiohttp/web_runner.py	92.44% <0.00%> (-5.34%)	⬇️
aiohttp/tcp_helpers.py	94.73% <0.00%> (-5.27%)	⬇️
aiohttp/pytest_plugin.py	92.50% <0.00%> (-5.00%)	⬇️
aiohttp/connector.py	94.88% <0.00%> (-1.92%)	⬇️
aiohttp/web_protocol.py	91.40% <0.00%> (-0.86%)	⬇️
aiohttp/test_utils.py	99.06% <0.00%> (-0.63%)	⬇️

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[asvetlov]

Thanks!

[aio-libs-github-bot]

💔 Backport was not successful

The PR was attempted backported to the following branches:

• ❌ 3.7: Commit could not be cherrypicked due to conflicts