[Tile-serving] [osm2pgsql-dev/osm2pgsql] Replace fmt::localtime with std::localtime (PR #2457)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2457)

There is a reason `fmt::localtime` was used and `not std::localtime`: 

> Converts given time since epoch as std::time_t value into calendar time, expressed in local time. Unlike std::localtime, this function is thread-safe on most platforms.
_(From the fmt docs)_

[This](https://en.cppreference.com/w/c/chrono/localtime.html) shows the mess that `localtime` is on various platforms in various versions. This needs to be figured out and tested on all platforms.

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