build(deps): Bump libtmux 0.15.7 -> 0.15.8

See also:
- tmux-python/libtmux#444
- Fixes #822

Author: tony

poetry.lock

@@ -47,7 +47,7 @@ tmuxp = 'tmuxp:cli.cli'
 [tool.poetry.dependencies]
 python = "^3.7"
 click = "~8"
-libtmux = "~0.15.7"
+libtmux = "~0.15.8"
 colorama = ">=0.3.9"
 
 [tool.poetry.dev-dependencies]