Fix deprecated warning for invalid escape sequence

[Maraxi]

Fixed the string in saspy/sasproccommons.py:398 to no longer contain an invalid escape sequence.
See some documentation in https://docs.astral.sh/ruff/rules/invalid-escape-sequence/.

As far as I can tell this only caused deprecation warnings since python3.6 and no actual errors.

Signed-off-by: Stefan Eysoldt stefan.eysoldt@deutsche-boerse.de

[tomweber-sas]

Hey, thanks for this. I appreciate the contribution. I see the message on windows (where these are often a problem when coding a backslash in any string). Linux doesn't care. I was able to easily see the warning on Win and see your change fixes it, as coding raw string literals are the easy solution for these on win.

win:

>>> print('/\:;.%')
<stdin>:1: SyntaxWarning: invalid escape sequence '\:'
/\:;.%
>>> print(r'/\:;.%')
/\:;.%
>>>

linux:

>>> '/\:;.%'
'/\\:;.%'
>>> print('/\:;.%')
/\:;.%
>>> print(r'/\:;.%')
/\:;.%
>>>