Add support for pyflakes 3.1

[yan12125]

pyflakes 3.1.0 was released a few days ago with Python 3.12 support and various other fixes/improvements [1]. Could you consider bumping version constraints for pyflakes [2]?

I tried removing the upper bound for pyflakes and use it with the latest pyflakes, but no warnings/errors are reported. I guess the issue is that ContinueInFinally is dropped from pyflakes [3], while python-lsp-server still tries to use it [4]. If I removed the line at [4], pyflakes 3.1 works fine with python-lsp-server.

[1] https://github.com/PyCQA/pyflakes/blob/3.1.0/NEWS.rst
[2] https://github.com/python-lsp/python-lsp-server/blob/v1.7.4/pyproject.toml#L35
[3] PyCQA/pyflakes#752
[4] https://github.com/python-lsp/python-lsp-server/blob/v1.7.4/pylsp/plugins/pyflakes_lint.py#L18

[ccordoba12]

Hey @yan12125, thanks for reporting. We can't update to that Pyflakes version before Flake8 adds support for it because we also support Flake8.

So, let us know when that happens and we'll be able to do it.

[yan12125]

Hi, flake8 6.1.0 has updated Pyflakes to >= 3.1.0, < 3.2.0 [1]. I think that is no longer a blocker?

[1] https://flake8.pycqa.org/en/latest/release-notes/6.1.0.html

[ccordoba12]

Correct. We'll address this in our next version then.