fix: stripe webhook validation

[michrosenberger]

The SubtleCryptoProvider cannot be used in a synchronous context. This is a problem for non-node environments where the Stripe client falls back to SubtleCryptoProvider.

Running the trigger.dev Stripe integration on Cloudflare Pages results in the following error:

{
  "error": {
    "name": "Error",
    "message": "SubtleCryptoProvider cannot be used in a synchronous context.\\nUse `await constructEventAsync(...)` instead of `constructEvent(...)`"
  },
  "timestamp": "2024-01-11T19:44:47.237Z",
  "name": "trigger.dev",
  "message": "[@trigger.dev/stripe] Error while validating webhook signature",
  "level": "error"
}

Even worse, without verbose logging enabled, this is just silently ignored and no event or job-run is triggered from trigger.dev

✅ Checklist

• I have followed every step in the contributing guide
• The PR title follows the convention.
• I ran and tested the code works

---

Changelog

Fix Stripe integration webhook validation.

💯

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[ericallam]

Has this been tested to still work on Node.js?

[michrosenberger]

Yes, tested and still works fine on Node.js.

[matt-aitken]

This is great @michrosenberger