[openstreetmap/openstreetmap-website] Increase may key and value max length (#2025)

[Tom Hughes]

I can't actually find any documentation of exactly what the rails validator polices but my guess is that it's the ruby string length which is probably codepoints rather than bytes or grapheme clusters.

So 255 UTF-16 values while wrong isn't totally terrible as characters outside the BMP will be relatively rare, and it will reject strings that the API would allow rather than allowing strings that the API will reject.

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