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sessions: Use raw string for regular expression

FeRD (Frank Dana) requested to merge ferdnyc/dogtail:ferdnyc-master-patch-51167 into master

Running pydoc on dogtail.sessionproduces some errors related to escaping, hinting at an issue in the module code:

$ pydoc3 dogtail.session
[...at exit...]
<unknown>:84: SyntaxWarning: invalid escape sequence '\.'
<unknown>:84: SyntaxWarning: invalid escape sequence '\.'
<unknown>:84: SyntaxWarning: invalid escape sequence '\.'
<unknown>:84: SyntaxWarning: invalid escape sequence '\.'

As it says, \. isn't a valid escape in Python strings — it should either be \\., or r'\.'. This MR goes with the latter.

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