title: wal_level < logical error while upgrading aurora postgres db
body: <p>I am trying to upgrade aurora postgres 10.11 to aurora postgres 11.9 in aws RDS aurora Postgres instance. The upgrade worked on test env, but the it gives following error on actual env</p>
  <blockquote>
  <p>logical replication slot &quot;replication_slot&quot; exists, but wal_level &lt; logical</p>
  </blockquote>
  <p>When I checked the system settings from pg_settings, its showing that the setting &quot;wal_level&quot; has value &quot;logical&quot;. and rds.logical_replication is set to 1</p>
  <p>this query returns below results</p>
  <pre><code>select name, setting, sourcefile, sourceline from pg_settings where name = 'wal_level';
  
  name     |setting|sourcefile|sourceline|
  ---------+-------+----------+----------+
  wal_level|logical|          |          |
  </code></pre>