[Tile-serving] [openstreetmap/osm2pgsql] appveyor: package libpq 11 (#1258)

[mmd]

Adding another one... and we're good to go!
```

osm2pgsql.exe -V
osm2pgsql version 1.2.0

Compiled using the following library versions:
Libosmium 2.15.6
Lua 5.3.4

```

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