Update poetry to 1.1

[tony]

See also tmux-python/tmuxp#689

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@27ea7e3). Click here to learn what that means.
The diff coverage is 91.66%.

❗ Current head c7d914c differs from pull request most recent head a69224e. Consider uploading reports for the commit a69224e to get more accurate results

@@            Coverage Diff            @@
##             master     #324   +/-   ##
=========================================
  Coverage          ?   87.06%           
=========================================
  Files             ?       16           
  Lines             ?     1515           
  Branches          ?        0           
=========================================
  Hits              ?     1319           
  Misses            ?      196           
  Partials          ?        0           

Impacted Files	Coverage Δ
libtmux/exc.py	100.00% <ø> (ø)
libtmux/formats.py	100.00% <ø> (ø)
libtmux/test.py	42.64% <ø> (ø)
setup.py	0.00% <0.00%> (ø)
libtmux/server.py	79.19% <75.00%> (ø)
libtmux/window.py	83.73% <81.25%> (ø)
libtmux/common.py	86.43% <85.71%> (ø)
tests/conftest.py	84.78% <90.00%> (ø)
libtmux/pane.py	82.35% <100.00%> (ø)
libtmux/session.py	80.95% <100.00%> (ø)
... and 6 more

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