CI run against Twisted trunk is failing

[github-actions]

See https://github.com/matrix-org/synapse/actions/runs/3329668215

[DMRobertson]

Covered by #14298

[DMRobertson]

Actually no:

 + poetry add -n --extras tls git+https://github.com/twisted/twisted.git#trunk

Updating dependencies
Resolving dependencies...

  KeyError

  'None'

  at /opt/pipx/venvs/poetry/lib/python3.8/site-packages/poetry/mixology/version_solver.py:112 in _propagate
      108│             # Iterate in reverse because conflict resolution tends to produce more
      109│             # general incompatibilities as time goes on. If we look at those first,
      110│             # we can derive stronger assignments sooner and more eagerly find
      111│             # conflicts.
    → 112│             for incompatibility in reversed(self._incompatibilities[package]):
      113│                 result = self._propagate_incompatibility(incompatibility)
      114│ 
      115│                 if result is _conflict:
      116│                     # If the incompatibility is satisfied by the solution, we use

Presumably related to twisted/twisted#11655?

[ofek]

Upgrade Poetry

[DMRobertson]

Uh oh, you're quite right:

pipx install poetry==1.1.14

Missed in the 1.67.0 release. We use 1.2.0 everywhere else.