build: replace black and isort with ruff

ruff format keeps black's style at the same line length, and ruff
check covers import sorting plus pycodestyle and pyflakes. Three
comments and a test regex are wrapped to fit 79 columns.

pqcli/ui/curses/views/game_view/character_sheet_window.py

@@ -61,6 +61,6 @@ class CharacterSheetWindow(Focusable, DataTableProgressBarWindow):
         self._cur_pos = self._player.exp_bar.position
         self._max_pos = self._player.exp_bar.max_
         self._progress_title = (
-            f"Experience ({self._max_pos-self._cur_pos:.0f} XP to go)"
+            f"Experience ({self._max_pos - self._cur_pos:.0f} XP to go)"
         )
         self._render_progress_bar()