[openstreetmap/openstreetmap-website] Disallow username changes to user_n if n isn't their id (PR #4218)

[Tom Hughes]

> Wasn't [this report](https://github.com/openstreetmap/openstreetmap-website/security/advisories/GHSA-2779-44wq-qcm8) seen by anyone again, like [previously](https://github.com/openstreetmap/openstreetmap-website/issues/4362)?

I don't appear to have received any notification of it that I can see in my email archives.

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