title: Warning: unexpected element (uri:"", local:"base-extension") after Android Target SDK was updated to 31.0.0
body: <p>After I update the target Android SDK from 30.0.3 to 31.0.0 I started to have these 2 warnings :</p>
  <blockquote>
  <p>This version only understands SDK XML versions up to 2 but an SDK XML file of version 3 was encountered. This can happen if you use versions of Android Studio and the command-line tools that were released at different times.</p>
  </blockquote>
  <blockquote>
  <p>Warning: unexpected element (uri:&quot;&quot;, local:&quot;base-extension&quot;). Expected elements are &lt;{}codename&gt;,&lt;{}layoutlib&gt;,&lt;{}api-level&gt;</p>
  </blockquote>
  <p>I tried to update all the libraries but it didn't help.
  Anyone had this warning ?</p>