fix: cpython ast fixes#3
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Fixes: https://github.com/elide-dev/WHIPLASH/issues/1211
ast.parse(..., feature_version=(3, 10))issueIncorrect translation in ACTION_MAPPINGS table.
Solution: Correct the erroneous tuple and regenerate.
ast.literal_eval()issueWhen constructing numbers in [AbstractParser.number_token()], the integer values are stored as long but can overflow into BigInteger where no-digit checks are performed.
Solution: Implement digit checks, check CPython's wording for this type of error.
del ast.AST._fieldsissueIts parent class is marked as immutable.
Solution: Mark ast.Ast as an exception to this rule, add null guards to init and new.