chore(codegen): bump smithy-typescript commit

Author: Steven Yuan

scripts/generate-clients/config.js

@@ -1,5 +1,5 @@
 // Update this commit when taking up new changes from smithy-typescript.
 module.exports = {
   // Use full commit hash as we explicitly fetch it.
-  SMITHY_TS_COMMIT: "a6d5a23bd699d8f6cb6f3bcb3eefcca254660595",
+  SMITHY_TS_COMMIT: "b9b29cccb5c54720bce02fc006234e208eeff15f",
 };