[openstreetmap/openstreetmap-website] Require user names to be unique after unicode normalisation (PR #4405)

[Andy Allan]

This looks good to me, and I like using postgresql to do the normalisation. And I like the roman numeral stuff in the tests too, nice find!

However, `normalize ( text [, form ] ) → text` isn't available in postgresql 12, which is our current minimum version as that's what shipped in Ubuntu 20.04. So if we want to merge this, then we need to update our minimums to postgresql 13, and by implication, Ubuntu 22.04. 

What do we all think about that? Personally, I'm sure you can guess how I noticed the issue, but I don't know how many other developers will be affected or whether I'm the only one who needs to knuckle down and do some updates.

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