Silence deprecation warning in __repr__

[bitdancer]

What do these changes do?

Are there changes in behavior for the user?

Related issue number

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new entry to CHANGES.rst
  • Choose any open position to avoid merge conflicts with other PRs.
  • Add a link to the issue you are fixing (if any) using #issue_number format at the end of changelog message. Use Pull Request number if there are no issues for PR or PR covers the issue only partially.

[codecov-io]

Codecov Report

Merging #1690 into 1.3 will decrease coverage by -0.48%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              1.3    #1690      +/-   ##
==========================================
- Coverage   98.26%   97.79%   -0.48%     
==========================================
  Files          31       31              
  Lines        7337     7337              
  Branches     1229     1229              
==========================================
- Hits         7210     7175      -35     
- Misses         75       86      +11     
- Partials       52       76      +24

Impacted Files	Coverage Δ
aiohttp/client_reqrep.py	97.31% <100%> (-0.58%)	❌
aiohttp/client.py	96.46% <0%> (-2.99%)	❌
aiohttp/helpers.py	95.51% <0%> (-1.29%)	❌
aiohttp/streams.py	97.83% <0%> (-0.97%)	❌
aiohttp/test_utils.py	99.25% <0%> (-0.75%)	❌
aiohttp/client_ws.py	97.83% <0%> (-0.55%)	❌
aiohttp/multipart.py	93.51% <0%> (-0.49%)	❌
aiohttp/web_ws.py	94.44% <0%> (-0.38%)	❌
aiohttp/web_reqrep.py	99.11% <0%> (-0.36%)	❌
... and 2 more

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[fafhrd91]

this is merged

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