title: error in importing pythin modules in mwaa dags
body: <p>I am using MWAA. I have included pysftp in mwaa requirements.txt file as</p>
  <pre><code>pysftp==0.2.9
  </code></pre>
  <p>In the scheduler log groups of MWAA I can even see that it is getting downloaded.</p>
  <pre><code>Collecting pysftp==0.2.9
    Downloading pysftp-0.2.9.tar.gz (25 kB)
  </code></pre>
  <p>but when I am trying to import it in my dags, I am getting the following error</p>
  <pre><code>Broken DAG: [/usr/local/airflow/dags/hello.py] Traceback (most recent call last):
    File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 219, in _call_with_frames_removed
    File &quot;/usr/local/airflow/dags/hello.py&quot;, line 2, in &lt;module&gt;
      import pysftp
  ModuleNotFoundError: No module named 'pysftp'
  </code></pre>
  <p>What might be causing this issue and what can be done to solve it?</p>