isort pre-commit hook failing in CI

[WeilerP]

ATM, the isort pre-commit hook is failing (see e.g. here). The issue is most likely the same one as reported in PyCQA/isort#2077 and PyCQA/isort#2078.

tox -e lint

[INFO] Installing environment for https://github.com/PyCQA/isort.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
An unexpected error has occurred: CalledProcessError: command: ('/home/runner/.cache/pre-commit/repor80a6zk3/py_env-python3/bin/python', '-mpip', 'install', '.', 'toml')
return code: 1
stdout:
    Processing /home/runner/.cache/pre-commit/repor80a6zk3
      Installing build dependencies: started
      Installing build dependencies: finished with status 'done'
      Getting requirements to build wheel: started
      Getting requirements to build wheel: finished with status 'done'
      Preparing metadata (pyproject.toml): started
      Preparing metadata (pyproject.toml): finished with status 'error'
    
stderr:
      error: subprocess-exited-with-error
      
      × Preparing metadata (pyproject.toml) did not run successfully.
      │ exit code: 1
      ╰─> [14 lines of output]
          Traceback (most recent call last):
            File "/home/runner/.cache/pre-commit/repor80a6zk3/py_env-python3/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
              main()
            File "/home/runner/.cache/pre-commit/repor80a6zk3/py_env-python3/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line [33](https://github.com/WeilerP/cellrank/actions/runs/4219264276/jobs/7324465780#step:6:34)5, in main
              json_out['return_val'] = hook(**hook_input['kwargs'])
            File "/home/runner/.cache/pre-commit/repor80a6zk3/py_env-python3/lib/python3.9/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 149, in prepare_metadata_for_build_wheel
              return hook(metadata_directory, config_settings)
            File "/tmp/pip-build-env-uz9qejtn/overlay/lib/python3.9/site-packages/poetry/core/masonry/api.py", line [40](https://github.com/WeilerP/cellrank/actions/runs/4219264276/jobs/7324465780#step:6:41), in prepare_metadata_for_build_wheel
              poetry = Factory().create_poetry(Path(".").resolve(), with_groups=False)
            File "/tmp/pip-build-env-uz9qejtn/overlay/lib/python3.9/site-packages/poetry/core/factory.py", line [57](https://github.com/WeilerP/cellrank/actions/runs/4219264276/jobs/7324465780#step:6:58), in create_poetry
              raise RuntimeError("The Poetry configuration is invalid:\n" + message)
          RuntimeError: The Poetry configuration is invalid:
            - [extras.pipfile_deprecated_finder.2] 'pip-shims<=0.3.4' does not match '^[a-zA-Z-_.0-9]+$'
          
          [end of output]
      
      note: This error originates from a subprocess, and is likely not a problem with pip.
    error: metadata-generation-failed
    
    × Encountered error while generating package metadata.
    ╰─> See above for output.
    
    note: This is an issue with the package mentioned above, not pip.
    hint: See above for details.

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