roll back to typescript 4.2, since 4.3 does not work with typedoc yet

Author: angelo-v

package-lock.json

@@ -100,7 +100,7 @@
     "standard": "^16.0.3",
     "ts-jest": "^26.4.4",
     "typedoc": "^0.20.28",
-    "typescript": "^4.1.3",
+    "typescript": "^4.2.4",
     "webpack": "^4.46.0",
     "webpack-cli": "^3.3.12"
   },