fix the download URL for mbtiles file
the URLs below are dead:
- https://mbtiles.top/planet/Combined.mbtiles
- https://osm.dbtc.link/mbtiles/2023-05-29-planet.mbtiles.lz4
the new URL is:
Issue: cortext/operations/cortext-env#48
the URLs below are dead:
the new URL is:
Issue: cortext/operations/cortext-env#48