Fix lock file from stable Poetry version

[wren]

The lock file in the develop file was generated from an alpha version of poetry (v1.2.0a1). This breaks the tests for older versions of python (my fault, sorry!).

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
• I have tested this code locally.
• I have checked to ensure there aren't other open pull requests
  for the same issue.
• I have written new tests for these changes, as needed.
• All tests pass.

[micahellison]

✨ 📃🔒 ✨