chore(codegen): bump smithy to 1.15.x

[trivikr]

Issue

Refs: smithy-lang/smithy-typescript#475

Description

Bump smithy to 1.15.x

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[codecov-commenter]

Codecov Report

Merging #3091 (0d9d93f) into main (5c63cef) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3091      +/-   ##
==========================================
- Coverage   58.72%   58.71%   -0.02%     
==========================================
  Files         571      571              
  Lines       30620    30620              
  Branches     7541     7541              
==========================================
- Hits        17982    17978       -4     
- Misses      12638    12642       +4     

Impacted Files	Coverage Δ
...tocoltests-restjson/src/protocols/Aws_restJson1.ts	43.61% <0.00%> (-0.12%)	⬇️

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[trivikr]

The tests for quoted strings were added in smithy-lang/smithy#986

[github-actions]

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