4.49.0

(feat): Add body-sort option to webhook signature payload format. When set to alphabetical, POST body parameters are sorted by key before being concatenated into the signing payload. This is required by providers like Twilio. Supported in both Fern Definition (body-sort: alphabetical inside payload-format) and OpenAPI specs (body-sort: alphabetical inside the payload-format block of x-fern-webhook-signature).