fix: uri escape presigned url

[srchase]

fix for invalid query string parameter: uri escape presigned url in request

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[codecov-io]

Codecov Report

Merging #773 into smithy-codegen will increase coverage by <.01%.
The diff coverage is 100%.

@@                Coverage Diff                 @@
##           smithy-codegen     #773      +/-   ##
==================================================
+ Coverage           92.33%   92.33%   +<.01%     
==================================================
  Files                 140      140              
  Lines                2753     2754       +1     
  Branches              478      478              
==================================================
+ Hits                 2542     2543       +1     
  Misses                211      211

Impacted Files	Coverage Δ
packages/middleware-sdk-rds/src/index.ts	87.75% <100%> (+0.25%)	⬆️

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[aws-sdk-js-automation]

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