[openstreetmap/openstreetmap-website] User preferences accepts only ASCII data (Issue #4001)

[bryceco]

### URL

https://api.openstreetmap.org/api/0.6/user/preferences/test

### How to reproduce the issue?

I noticed this with emoji values, and verified it with a ć character. 

> curl -X PUT -d ‘👀’ https://api.openstreetmap.org/api/0.6/user/preferences/test
Encoding::CompatibilityError: incompatible encoding regexp match (UTF-8 regexp with ASCII-8BIT string)

### Screenshot(s) or anything else?

_No response_

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