fix(clients): properly decode SQS messages

[pauldraper]

Fixes #2362.

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Codecov Report

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@@           Coverage Diff           @@
##             main    #2364   +/-   ##
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  Coverage        ?   58.88%           
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  Files           ?      482           
  Lines           ?    25928           
  Branches        ?     6154           
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  Hits            ?    15267           
  Misses          ?    10661           
  Partials        ?        0           

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[alexforsyth]

@pauldraper Thanks so much for the PR. Just as a heads up, we shouldn't generally be making updates to /clients this is generated code using our code generator: smithy-typescript

[trivikr]

Superceded by #2381

[pauldraper]

Thanks for the real fix :)

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