[dev] Update dependency typescript to v3.9.9 (#81)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

example/package-lock.json

@@ -19,6 +19,6 @@
     "@types/react": "17.0.1",
     "@types/react-dom": "17.0.0",
     "parcel": "1.12.4",
-    "typescript": "3.9.7"
+    "typescript": "3.9.9"
   }
 }

example/package.json

@@ -46,7 +46,7 @@
     "react-test-renderer": "16.14.0",
     "tsdx": "0.13.3",
     "tslib": "1.14.1",
-    "typescript": "3.9.7"
+    "typescript": "3.9.9"
   },
   "dependencies": {
     "tiny-invariant": "^1.1.0"