Workaround for BPO-42130

[ods]

Changes

Fixes the problem with asyncio.wait_for(). Python 3.9 is added to CI and project classifiers.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 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 #802 (676e4fa) into master (444a1a7) will increase coverage by 0.00%.
The diff coverage is 96.29%.

@@           Coverage Diff           @@
##           master     #802   +/-   ##
=======================================
  Coverage   97.96%   97.96%           
=======================================
  Files          31       31           
  Lines        5307     5309    +2     
=======================================
+ Hits         5199     5201    +2     
  Misses        108      108           

Flag	Coverage Δ
cext	88.67% <96.29%> (+0.06%)	⬆️
integration	97.92% <96.29%> (+<0.01%)	⬆️
purepy	97.40% <96.29%> (-0.10%)	⬇️
unit	51.94% <59.25%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
aiokafka/consumer/fetcher.py	97.48% <94.11%> (-0.18%)	⬇️
aiokafka/conn.py	93.83% <100.00%> (+0.24%)	⬆️
aiokafka/util.py	97.95% <100.00%> (+0.18%)	⬆️

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[tvoinarovskyi]

lgtm!