Fix S3 checksum validation warnings

[EESergey]

Related: aws/aws-sdk-go-v2#3032

[codecov]

Codecov Report

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

Project coverage is 3.02%. Comparing base (7c69795) to head (b10e905).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/s3/s3.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #107      +/-   ##
=========================================
- Coverage    3.03%   3.02%   -0.01%     
=========================================
  Files          11      11              
  Lines         924     925       +1     
=========================================
  Hits           28      28              
- Misses        896     897       +1     

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