[Tile-serving] [openstreetmap/osm2pgsql] Make it compile with C++20 and update CMake config (PR #1987)

[Jochen Topf]

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1987

-- Commit Summary --

  * Make our use of fmt library work with C++20
  * Github action: Also build in C++20 mode
  * CMake config: More modern way of defining the C++ version to use

-- File Changes --

    M .github/workflows/ci.yml (60)
    M CMakeLists.txt (8)
    M src/CMakeLists.txt (4)
    M src/format.hpp (5)
    M src/middle-pgsql.cpp (2)
    M src/pgsql.hpp (2)
    M tests/CMakeLists.txt (1)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1987.patch
https://github.com/openstreetmap/osm2pgsql/pull/1987.diff

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