Webhook stopped sending expo-signature header

### Build/Submit details page URL

_No response_

### Summary

I am reaching out to bring an issue to your attention regarding the Expo webhooks I have set up to receive alerts on builds and submits within Expo. Until recently, the webhooks were functioning as expected. However, I have observed that the expo-signature has stopped being sent with the webhook requests.

Given that our webhook URL is publicly accessible, it is crucial for us to validate incoming requests to ensure their legitimacy. The absence of the expo-signature is preventing us from doing so, as we rely on it as a key component of our validation process.

I have checked the status page for any relevant updates or known issues, but did not find any mention of this particular problem.

Could you please look into this matter and provide clarification on why the expo-signature is no longer being sent with the webhook requests? Your assistance in resolving this issue will be greatly appreciated, as the webhooks are a vital part of our workflow.

### Managed or bare?

Managed

### Environment

webhooks

### Error output

_No response_

### Reproducible demo or steps to reproduce from a blank project

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