Incorrect type hints for SafeEval.nodes, opmaps

[pandaxtc]

Hello! I believe that the dicts nodes, unaryOpMap, and dualOpMap initialized in SafeEval's constructor have the wrong type hints. For example,

safeeval/safeeval/__init__.py

Line 32 in b16db10

self.nodes: Dict[ast.AST, Callable[[ast.AST, Dict[str, Any]], Any]] = {

The type hint Dict[ast.AST, ...] should instead be Dict[type[ast.AST], ...]. The current hint indicates a dict with keys that are instances of AST, and not the classes themselves.

Thank you for the package!