integrationTests: test package with TS 4.2 (#3036)

Author: IvanGoncharov

integrationTests/ts/package.json

@@ -9,6 +9,7 @@
     "typescript-3.8": "npm:[email protected]",
     "typescript-3.9": "npm:[email protected]",
     "typescript-4.0": "npm:[email protected]",
-    "typescript-4.1": "npm:[email protected]"
+    "typescript-4.1": "npm:[email protected]",
+    "typescript-4.2": "npm:[email protected]"
   }
 }