`pyppeteer` emits SyntaxWarnings due to invalid escape sequences

[suhaibmujahid]

pyppeteer is a dependency for requests-html and it is used in bugbug/code_search/searchfox_api.py

/app/.venv/lib/python3.12/site-packages/pyppeteer/us_keyboard_layout.py:73: SyntaxWarning: invalid escape sequence '\('
  'Digit9': {'keyCode': 57, 'code': 'Digit9', 'shiftKey': '\(', 'key': '9'},
/app/.venv/lib/python3.12/site-packages/pyppeteer/us_keyboard_layout.py:143: SyntaxWarning: invalid escape sequence '\<'
  'Comma': {'keyCode': 188, 'code': 'Comma', 'shiftKey': '\<', 'key': ','},
/app/.venv/lib/python3.12/site-packages/pyppeteer/us_keyboard_layout.py:247: SyntaxWarning: invalid escape sequence '\<'
  '<': {'keyCode': 188, 'key': '\<', 'code': 'Comma'},