fix: upgrade typescript from 4.4.2 to 4.4.3 (#420)

Snyk has created this PR to upgrade typescript from 4.4.2 to 4.4.3.

See this package in npm:
https://www.npmjs.com/package/typescript

See this project in Snyk:
https://app.snyk.io/org/kpt-fn-bot/project/046a0d33-b384-4105-962d-be6f1db5074a?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

ts/demo-functions/package-lock.json

@@ -41,7 +41,7 @@
     "tslint": "^6.1.3",
     "tslint-config-prettier": "1.18.0",
     "tslint-consistent-codestyle": "^1.16.0",
-    "typescript": "^4.4.2"
+    "typescript": "^4.4.3"
   },
   "kpt": {
     "docker_repo_base": "gcr.io/kpt-functions"