Fix unit tests by updating auth for dynamodb-local 2.x

[lpsinger]

See https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.DownloadingAndRunning.html.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (00c8018) 90.90% compared to head (95b4739) 90.90%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #6   +/-   ##
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  Coverage   90.90%   90.90%           
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  Files           1        1           
  Lines          22       22           
  Branches        3        3           
=======================================
  Hits           20       20           
  Misses          1        1           
  Partials        1        1           

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