Fix `validateWebhook` backwards incompatibility with Node 18.x#299

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mattt wants to merge 2 commits intomainfrom

mattt/fix-validate-webhook-node-18

Commits on Aug 28, 2024

Use backward compatible syntax for accessing object keys on requestData.headers
jakedahn
committed
Stringifying requestData.body when it is of type object. This is backward compatibility for Next.js 12.1.x / Node.js v18
jakedahn
committed