Fix type annotation

Author: markshannon

Tools/cases_generator/flags.py

@@ -98,7 +98,7 @@ def __post_init__(self) -> None:
         self.bitmask = {name: (1 << i) for i, name in enumerate(self.names())}
 
     @staticmethod
-    def fromInstruction(instr: parsing.Node) -> "InstructionFlags":
+    def fromInstruction(instr: parsing.InstDef) -> "InstructionFlags":
         has_free = (
             variable_used(instr, "PyCell_New")
             or variable_used(instr, "PyCell_GET")