Allow to use Final and ClassVar after python 3.13

Author: aliwo

mypy/semanal.py

@@ -3657,7 +3657,7 @@ def unwrap_final(self, s: AssignmentStmt) -> bool:
         else:
             s.type = s.unanalyzed_type.args[0]
 
-        if s.type is not None and self.is_classvar(s.type):
+        if s.type is not None and self.options.python_version < (3, 13) and self.is_classvar(s.type):
             self.fail("Variable should not be annotated with both ClassVar and Final", s)
             return False
 

test-data/unit/check-final.test

@@ -1134,7 +1134,7 @@ class A:
     a: Final[ClassVar[int]]  # E: Variable should not be annotated with both ClassVar and Final
     b: ClassVar[Final[int]]  # E: Final can be only used as an outermost qualifier in a variable annotation
     c: ClassVar[Final] = 1  # E: Final can be only used as an outermost qualifier in a variable annotation
-[out]
+[out version<3.13]
 
 [case testFinalClassWithAbstractMethod]
 from typing import final