fix(http): reject malformed JSON in webhook adapter

[huntharo]

Fix uncaught JSON parse exception in http webhook adapter

Fixes #871

Summary

The Node http/https webhook adapter could throw an uncaught exception when the request body contains malformed JSON.
This PR converts that failure mode into a rejected update promise and adds a regression test.

Problem

• Source location: src/convenience/frameworks.ts (http adapter update getter), around src/convenience/frameworks.ts#L452-L466.
• Previously, JSON.parse(raw) could throw inside the "end" event callback, escaping normal promise rejection flow.

Changes

1. Wrap JSON.parse(raw) in try/catch and call reject(err) on parse failures.
2. Add regression test http should reject malformed JSON bodies in test/convenience/webhook.test.ts#L163-L200.

Validation

1. Reproduced failure with reverted fix:
   • deno test --seed=123456 --parallel --allow-import ./test/ test/convenience/webhook.test.ts
   • Failing step: framework adapters ... http should reject malformed JSON bodies
2. Re-ran with fix applied:
   • deno test --seed=123456 --parallel --allow-import ./test/ test/convenience/webhook.test.ts
   • Result: pass (40 passed, 0 failed)

Notes

• Behavior after this change is consistent with other adapter error paths: malformed payloads are propagated as async rejections that callers can handle.

[KnorpelSenf]

Nice catch

[KnorpelSenf]

@all-contributors add @huntharo for bug, code, and test

[allcontributors]

@KnorpelSenf

I've put up a pull request to add @huntharo! 🎉

[KnorpelSenf]

This was released in 1.40.1.