title: Python formatter "black" stopped working?
body: <p>Can't open an issue on github atm because I get a 500 error for 30minutes now when trying to create the issue.</p>
  <ul>
  <li>VS Code Version: 1.59.0</li>
  <li>OS Version: Windows 10 Professional 64bit 21H2 19043.1151</li>
  </ul>
  <p>Steps to Reproduce:</p>
  <ol>
  <li>Clean install of VS Code</li>
  <li>Clean install of Python 3.9.6</li>
  <li>pip install black (version 21.7b0)</li>
  <li>Install VS Code extension &quot;Python&quot;</li>
  <li>in VS Code set formatter to &quot;black&quot;</li>
  <li>open project folder</li>
  <li>open test.py file from project</li>
  <li>save unformatted file with CTRL+S --&gt; &quot;Formatting with black&quot; appears in the bottom corner but nothing happens</li>
  </ol>
  <p>user settings.json</p>
  <pre><code>{
      &quot;python.formatting.provider&quot;: &quot;black&quot;,
      &quot;editor.formatOnSave&quot;: true
  }
  </code></pre>
  <p>workspace settings.json</p>
  <pre><code>{
      &quot;python.formatting.provider&quot;: &quot;black&quot;
  }
  </code></pre>
  <p>It works when I call &quot;black&quot; via CMD --&gt; &quot;black test.py&quot;</p>
  <pre><code>reformatted test.py
  All done! ✨  ✨
  1 file reformatted.
  </code></pre>
  <p>Already tried reinstalling VS Code / Python and restarting the PC???</p>