CI run against Twisted trunk is failing

[github-actions]

See https://github.com/matrix-org/synapse/actions/runs/2113888041

[DMRobertson]

https://github.com/matrix-org/synapse/runs/5881698486?check_suite_focus=true

Failure in sytest. Poetry couldn't install thrift---but it also downgraded it as part of the poetry install? Needs investigation.

[DMRobertson]

This succeeded on a re-run. I'm going to assume this is a flake. For completeness, the complaint from the "Run SyTest" step was:

  • Updating thrift (0.16.0 -> 0.15.0)
  • Installing tqdm (4.63.0)
  • Installing types-cryptography (3.3.15)
  • Installing types-urllib3 (1.26.10)
  • Installing zope.schema (6.2.0)

  EnvCommandError

  Command ['/synapse/.venv/bin/pip', 'install', '--no-deps', '/github/home/.cache/pypoetry/artifacts/7c/b7/77/d5fe572b0165704945977ef97aeea1ba572a64299d08cb121f46b6c925/types_urllib3-1.26.10-py3-none-any.whl'] errored with the following return code 1, and output: 
  Processing /github/home/.cache/pypoetry/artifacts/7c/b7/77/d5fe572b0165704945977ef97aeea1ba572a64299d08cb121f46b6c925/types_urllib3-1.26.10-py3-none-any.whl
  Installing collected packages: types-urllib3
  ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/venv/lib/python3.7/site-packages/thrift-0.16.0.egg-info/PKG-INFO'
  
  

  at /usr/local/lib/python3.7/dist-packages/poetry/utils/env.py:1183 in _run
      1179│                 output = subprocess.check_output(
      1180│                     cmd, stderr=subprocess.STDOUT, **kwargs
      1181│                 )
      1182│         except CalledProcessError as e:
    → 1183│             raise EnvCommandError(e, input=input_)
      1184│ 
      1185│         return decode(output)
      1186│ 
      1187│     def execute(self, bin, *args, **kwargs):

Error: Process completed with exit code 1.