chore(codegen): update for String dispatch fix

Author: kuhe

scripts/generate-clients/config.js

@@ -1,7 +1,7 @@
 // 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: "7f0bf78613de2d09d1648f5deb698e1a6456f251",
+  SMITHY_TS_COMMIT: "ce56edfde025985f769cc34b18e3ee3a99a7942a",
 };
 
 if (module.exports.SMITHY_TS_COMMIT.length < 40) {