[openstreetmap/openstreetmap-website] Switch to TIMESTAMP WITH TIME ZONE for current_* tables (#375)

[mmd]

Quick question on this one. Cgimap has some queries like the example eblow. Assuming we're running the server at non-UTC-0 time, would we need to apply to changes to the code then once the data type has an additional `with local time zone`? My assumption would be yes here, so we'd probably need a Github issue on cgimap to cover this change.

```C++
  m_connection.prepare("extract_nodes",
    "SELECT n.id, n.latitude, n.longitude, n.visible, "
        "to_char(n.timestamp,'YYYY-MM-DD\"T\"HH24:MI:SS\"Z\"') AS timestamp, "
        "n.changeset_id, n.version, array_agg(t.k) as tag_k, array_agg(t.v) as tag_v "
      "FROM current_nodes n "
        "LEFT JOIN current_node_tags t ON n.id=t.node_id "
      "WHERE n.id = ANY($1) "
"GROUP BY n.id ORDER BY n.id")
```

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