Deprecate tmux versions below 3.2a

[tony]

See also:

• Deprecate tmux versions below 3.2a libtmux#606
• py(deps) libtmux 0.47.0 -> 0.48.0 #990

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.08%. Comparing base (d2f2b36) to head (7a2622e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #991   +/-   ##
=======================================
  Coverage   73.08%   73.08%           
=======================================
  Files          26       26           
  Lines        1854     1854           
  Branches      352      352           
=======================================
  Hits         1355     1355           
  Misses        395      395           
  Partials      104      104           

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