[openstreetmap/openstreetmap-website] bump pg version in doc (#2404)

[mmd]

Production still uses 9.5, so simply updating the docs won't help in any case.

Can't we make that statement depend on the actual Postgresql version in use, and only execute it if it is supported? 

```sql
DO $$

DECLARE pg_version int := current_setting('server_version_num');

BEGIN

IF pg_version >= 90600 THEN
  EXECUTE 'SET idle_in_transaction_session_timeout = 0';
END IF;

END $$ LANGUAGE plpgsql;

```

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