Set uvloop for current thread explicitly.

[ivaaahn]

Should help fix a similar problem to #229, but in the case of using uvloop.

I caught this problem on python3.8 with uvloop.

[s3rius]

Looks good to me. Thanks for contribution.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.31%. Comparing base (7030a54) to head (69b65e0).
Report is 44 commits behind head on develop.

Files	Patch %	Lines
taskiq/cli/worker/run.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #270   +/-   ##
========================================
  Coverage    77.31%   77.31%           
========================================
  Files           60       60           
  Lines         1750     1750           
========================================
  Hits          1353     1353           
  Misses         397      397           

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