snippets: fix python 3.12+ invalid escape sequence warnings #707
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In Python 3.12+, invalid escape sequences changed from a DeprecationWarning to SyntaxWarning.
/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/Document.py:830: SyntaxWarning: invalid escape sequence '/'
prot1 = re.match('(^[a-z]+://|/)(.)', first)
/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/Document.py:831: SyntaxWarning: invalid escape sequence '/'
prot2 = re.match('(^[a-z]+://|/)(.)', second)
/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/SubstitutionParser.py:162: SyntaxWarning: invalid escape sequence '\s'
match = re.match('\\?%s\s*' % self.REG_GROUP, tokens)