title: How to upgrade postgresql database from 10 to 12 without losing data for openproject
body: <p>My OpenProject management software is installed with default postgresql 10.
  Currently the postgresql DB is 12, It is having lot of new features.</p>
  
  <p>I want to upgrade my Postgres DB without losing the data in the DB.
  My system is ubuntu 18.04 and hosted  openproject.</p>
  
  <p>I searched the internet and could not find a step by step to upgrade postgresql.</p>
  
  <p>Can you please guide me to install new DB and all data should be in the new DB.
  thanks for your help.</p>