Update videos endpoint

## Acceptance criteria

- [ ] There is an endpoint available for updating video ratings
- [ ] The endpoint accepts an appropriate HTTP method
- [ ] The endpoint has an appropriate URL
- [ ] The endpoint updates the ratings of videos in the database

Start by locating the existing videos endpoint and the code that persists video ratings. Determine the appropriate HTTP method and URL from nearby routes, then verify that the endpoint updates ratings in the database; the acceptance criteria define completion, but no files or tests are named.

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