[Tile-serving] [openstreetmap/osm2pgsql] Fix build with v10 of the fmt library (PR #2000)

[Jochen Topf]

`fmt::underlying` was only introduced in fmt 9.0.0. So this would break on Ubuntu 22.04 for instance which has fmt 8.1.1. I think we need a different solution here. Either we use `std::underlying_type` which is available since C++11, or maybe we should even output the status not as a number but some symbolic name.

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