feat: upgrade stripe from 11.18.0 to 16.4.0

Snyk has created this PR to upgrade stripe from 11.18.0 to 16.4.0.

See this package in npm:
stripe

See this project in Snyk:
https://app.snyk.io/org/cachiman/project/c0a94bdf-9b32-40d6-a587-0a45b5778d80?utm_source=github-cloud-app&utm_medium=referral&page=upgrade-pr

examples/webhook-signing/koa/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "dotenv": "^8.2.0",
     "koa": "^2.14.1",
-    "stripe": "^11.9.1",
+    "stripe": "^16.4.0",
     "koa-bodyparser": "^4.3.0"
   },
   "devDependencies": {