chore(dep): bump typescript to 4.2.4 (#316)

Author: AllanZhengYP

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json

@@ -33,7 +33,7 @@
     "rimraf": "^3.0.0",
     "ts-jest": "^26.4.1",
     "typedoc": "^0.19.2",
-    "typescript": "~4.1.2"
+    "typescript": "~4.2.4"
   },
   "engines": {
     "node": ">=10.0.0"