[Tile-serving] [openstreetmap/osm2pgsql] Use Python 3 for regression-test.py. (#939)

[Bas Couwenberg]

Switch to Python 3 since Python 2 is EOL at the end of the year.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/939

-- Commit Summary --

  * Use Python 3 for regression-test.py.

-- File Changes --

    M CONTRIBUTING.md (2)
    M tests/CMakeLists.txt (2)
    M tests/regression-test.py (62)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/939.patch
https://github.com/openstreetmap/osm2pgsql/pull/939.diff

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