Fix Python 3.12: SyntaxWarning: invalid escape sequence '\s' (closes #1312)

[u1735067]

This fixes #1312 (Python 3.12: SyntaxWarning: invalid escape sequence '\s' (tty.py:55)) by using the Python raw string syntax where \ are not evaluated.

[u1735067]

I don't think the following error is related to my change, maybe a dependency?

======================================================================
ERROR: test_device_facts (tests.unit.test_device.TestDevice)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/unittest/mock.py", line 1336, in patched
    return func(*newargs, **newkeywargs)
  File "/home/runner/work/py-junos-eznc/py-junos-eznc/tests/unit/test_device.py", line 526, in test_device_facts
    assert self.dev.facts["version"] == facts["version"]
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/jnpr/junos/factcache.py", line 119, in __getitem__
    raise RuntimeError(
RuntimeError: The jnpr.junos.facts.get_software_information module returned the model fact, but does not list model as a provided fact. Please report this error.

But if so, I'm not familiar enough with the codebase to understand why, sorry.