fixex #1750

[alex-eri]

trivial

What do these changes do?

Fixes #1750 Encoding is always UTF-8 in POST data

Are there changes in behavior for the user?

Nope

Related issue number

#1750

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 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 #1752 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1752   +/-   ##
=======================================
  Coverage   97.41%   97.41%           
=======================================
  Files          37       37           
  Lines        7432     7432           
  Branches     1288     1288           
=======================================
  Hits         7240     7240           
  Misses         79       79           
  Partials      113      113

Impacted Files	Coverage Δ
aiohttp/formdata.py	98.78% <ø> (ø)	⬆️

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[fafhrd91]

thanks

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