Update dependency typescript to v4.2.4

Author: renovate-bot

package-lock.json

@@ -66,7 +66,7 @@
     "source-map-loader": "2.0.1",
     "ts-jest": "26.5.5",
     "ts-loader": "8.0.11",
-    "typescript": "4.1.2",
+    "typescript": "4.2.4",
     "vue": "2.6.12",
     "vue-axios": "3.2.4",
     "vue-template-compiler": "2.6.12",