Deprecation warning due to invalid escape sequences in Python 3.7

[tirkarthi]

Deprecation warnings are raised due to invalid escape sequences. This can be fixed by using raw strings or escaping the literals.

find . -iname '*.py' | grep -v example | xargs -P 4 -I{} python3.8 -Wall -m py_compile {}
./pyautogui/_pyautogui_x11.py:262: DeprecationWarning: invalid escape sequence \e
  '\e': _display.keysym_to_keycode(Xlib.XK.string_to_keysym('Escape')),

[cclauss]

Use r'\e' instead of '\e'.

% ruff rule W605