Syntax warning because of "\S" in Python 3.12

[benoit9126]

Hi!

When I import your package using Python 3.12, a syntax warning is emitted.

>>> import machineid
/home/user/.pyenv/versions/venv-name/lib/python3.12/site-packages/machineid/__init__.py:70: SyntaxWarning: invalid escape sequence '\S'
  id = __reg__('HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography', 'MachineGuid')

This is related to this PR of CPython python/cpython#99011. Could it be possible to add a r before this string to avoid this warning (that will become a SyntaxError in future Python releases)

id = __reg__(r"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography", "MachineGuid")

[ezekg]

Would you be open to a PR?

[benoit9126]

Sure!