Fix Python 3.12 regex SyntaxWarning in slugify whitespace collapsing

[Copilot]

This change ports upstream mozilla/unicode-slugify PR mozilla#41 into this fork to resolve a Python 3.12 SyntaxWarning triggered by the slug normalization regex. The warning came from a non-raw pattern string containing \s.

• Root cause

  • The whitespace-collapse regex in slugify() used a normal string literal, so \s was parsed as an invalid escape sequence in Python 3.12 warning mode.

• Change applied

  • Updated the regex pattern to a raw string in slugify/__init__.py:
    • from '[%s\s]+'
    • to r'[%s\s]+'
  • Behavior is preserved; only string-literal parsing semantics are corrected.

• Patch excerpt

  # before
  new = re.sub('[%s\s]+' % space_replacement, space_replacement, new)
  
  # after
  new = re.sub(r'[%s\s]+' % space_replacement, space_replacement, new)

[markjm]

thanks bot