fix: upgrade moment from 2.27.0 to 2.28.0

Snyk has created this PR to upgrade moment from 2.27.0 to 2.28.0.

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

See this project in Snyk:
https://app.snyk.io/org/twilio-labs/project/8c09f0d1-b237-4a4e-9c08-2e801a973b3f?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -23,7 +23,7 @@
     "@twilio-labs/serverless-api": "^4.0.1",
     "@twilio/cli-core": "^5.9.0",
     "lodash": "^4.17.20",
-    "moment": "^2.24.0",
+    "moment": "^2.28.0",
     "nanoid": "^3.1.12"
   },
   "devDependencies": {