[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3270: Don't dirty the working copy with `tox -e codechecks`

[Tahoe-LAFS]

#3270: Don't dirty the working copy with `tox -e codechecks`
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 The pyproject.toml file gets moved around during this step because of
 weird Python packaging issues.

 Since towncrier 19.2 there is a better way, the `--pyproject` option.  Use
 it.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3270>
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