Update Python ASDL for Python 3.12

From python/cpython@46c1097

Author: zanieb

ast/Python.asdl

@@ -10,20 +10,22 @@ module Python
 
     stmt = FunctionDef(identifier name, arguments args,
                        stmt* body, expr* decorator_list, expr? returns,
-                       string? type_comment)
+                       string? type_comment, type_param* type_params)
           | AsyncFunctionDef(identifier name, arguments args,
                              stmt* body, expr* decorator_list, expr? returns,
-                             string? type_comment)
+                             string? type_comment, type_param* type_params)
 
           | ClassDef(identifier name,
              expr* bases,
              keyword* keywords,
              stmt* body,
-             expr* decorator_list)
+             expr* decorator_list,
+             type_param* type_params)
           | Return(expr? value)
 
           | Delete(expr* targets)
           | Assign(expr* targets, expr value, string? type_comment)
+          | TypeAlias(expr name, type_param* type_params, expr value)
           | AugAssign(expr target, operator op, expr value)
           -- 'simple' indicates that we annotate simple name without parens
           | AnnAssign(expr target, expr annotation, expr? value, int simple)
@@ -142,4 +144,9 @@ module Python
              attributes (int lineno, int col_offset, int end_lineno, int end_col_offset)
 
     type_ignore = TypeIgnore(int lineno, string tag)
+
+    type_param = TypeVar(identifier name, expr? bound)
+               | ParamSpec(identifier name)
+               | TypeVarTuple(identifier name)
+               attributes (int lineno, int col_offset, int end_lineno, int end_col_offset)
 }