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

[Yves Pratter]

> Planet generation: will create incompatible pbf or fail.

The length of a serialized object is coded as a variable length integer:
_"Protocol Buffers use a variable-bit encoding for integers. An integer is encoded at 7 bits per byte, where the high bit indicates whether or not the next byte is to be read.…"_
[Source](https://wiki.openstreetmap.org/wiki/PBF_Format#Low_level_encoding)

So the size of a key or a value is "unlimited" in practice.

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