setup.py: fix version parsing on Python 3.14 (ast.Str removed)
#589
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Python 3.14 removes the ast.Str node type. String literals now appear as ast.Constant(value=str). Update the AST check to accept both ast.Str (for older Pythons) and ast.Constant with a string value (for Python 3.8+), allowing html5lib to build successfully on Python 3.14 while remaining compatible with older version.
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Python 3.14 removes the ast.Str node type. String literals now appear as ast.Constant(value=str).
Update the AST check to accept both ast.Str (for older Pythons) and ast.Constant with a string value (for Python 3.8+), allowing html5lib to build successfully on Python 3.14 while remaining compatible with older version. Tested at desk with
pip install -e .Fixes: #588