Update dependency typescript to v3.9.3

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "tslint": "6.1.2",
     "tslint-config-prettier": "1.18.0",
     "typedoc": "0.17.7",
-    "typescript": "3.9.2",
+    "typescript": "3.9.3",
     "uuid": "8.0.0"
   },
   "scripts": {