[Tile-serving] [openstreetmap/osm2pgsql] Update example config to appropriate timestamp types (Issue #1785)

[Paul Norman]

While reviewing #1784 I noticed that the attributes.lua example uses `sql_type = 'timestamp'`.

`timestamp` (without time zone) [should not be used to store UTC times](https://wiki.postgresql.org/wiki/Don't_Do_This#Don.27t_use_timestamp_.28without_time_zone.29_to_store_UTC_times). Instead, it should be `timestamptz`

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