remove duplicate imports

[knbr13]

aws/aws.go:28: remove duplicate import statements, the github.com/aws/aws-sdk-go-v2/config is imported twice,

docstore/awsdynamodb/query_test.go:27: remove duplicate import statements, the github.com/aws/aws-sdk-go/service/dynamodb is imported twice.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.24%. Comparing base (9e81e8d) to head (8994bab).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
aws/aws.go	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3516      +/-   ##
==========================================
- Coverage   73.26%   73.24%   -0.03%     
==========================================
  Files         113      113              
  Lines       15065    15065              
==========================================
- Hits        11038    11034       -4     
- Misses       3261     3265       +4     
  Partials      766      766              

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