Update user-agent restrictions

This endpoint allows updating user-agent restrictions for a specific playback ID associated with a media asset. It can be used to allow or deny specific user-agents during playback request evaluation.

How it works:

1. Make a PATCH request to the endpoint with the updated user-agent restriction configuration.
2. Specify a default policy (allow or deny) and provide specific allow or deny lists.
3. Useful for restricting access to certain browsers, devices, or bots.

Example: A developer may configure a playback ID to deny access from known scraping user-agents while allowing all others by default.