[PR #6107/cd4c700d backport][3.8] Free resp conn @ test_mark_formdata_as_processed

[patchback]

This is a backport of PR #6107 as merged into master (cd4c700).

What do these changes do?

This patch attempts to make the tests more stable by explicitly closing the open resouces.

Are there changes in behavior for the user?

No.

Related issue number

I saw this being flaky @ #5930 (before restarting the CI).

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 #6109 (cd4c700) into 3.8 (66e281f) will decrease coverage by 4.21%.
The diff coverage is 90.31%.

❗ Current head cd4c700 differs from pull request most recent head 9f8f6fa. Consider uploading reports for the commit 9f8f6fa to get more accurate results

@@            Coverage Diff             @@
##              3.8    #6109      +/-   ##
==========================================
- Coverage   97.52%   93.31%   -4.22%     
==========================================
  Files          44      102      +58     
  Lines        8865    30063   +21198     
  Branches     1429     2690    +1261     
==========================================
+ Hits         8646    28054   +19408     
- Misses        103     1833    +1730     
- Partials      116      176      +60     

Flag	Coverage Δ
unit	93.24% <90.11%> (-4.11%)	⬇️

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

Impacted Files	Coverage Δ
aiohttp/web_fileresponse.py	98.62% <ø> (-1.38%)	⬇️
aiohttp/web_log.py	100.00% <ø> (ø)
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	92.34% <ø> (-5.29%)	⬇️
aiohttp/web_server.py	94.28% <ø> (-5.72%)	⬇️
aiohttp/web_urldispatcher.py	97.54% <ø> (-0.06%)	⬇️
... and 135 more

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