Update dependency typescript to v3.9.10

Author: renovate-bot

package-lock.json

@@ -57,7 +57,7 @@
     "tslint-config-airbnb": "5.11.2",
     "tslint-config-prettier": "1.18.0",
     "tslint-plugin-prettier": "2.1.0",
-    "typescript": "3.7.3",
+    "typescript": "3.9.10",
     "upload-opera-extension": "1.0.3",
     "utc-version": "2.0.1",
     "web-ext": "^4.1.0",