chore(deps): Bump @types/node from 20.5.3 to 20.6.0 in /functions/new…

…sletter (#686)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 20.5.3 to 20.6.0.
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functions/newsletter/package.json

@@ -15,7 +15,7 @@
   "license": "MIT",
   "dependencies": {
     "@netlify/functions": "^1.6.0",
-    "@types/node": "^20.5.3",
+    "@types/node": "^20.6.0",
     "node-fetch": "^3.3.0",
     "typescript": "^5.1.3"
   }