Sync corresponding incremental test

Author: sterliakov

test-data/unit/check-incremental.test

@@ -5675,10 +5675,12 @@ class FinalEnum(Enum):
 [builtins fixtures/isinstance.pyi]
 [out]
 main:3: error: Cannot override writable attribute "x" with a final one
+main:3: error: Incompatible types in assignment (expression has type "Ok", base class "RegularEnum" defined the type as "int")
 main:4: error: Cannot extend enum with existing members: "FinalEnum"
 main:5: error: Cannot override final attribute "x" (previously declared in base class "FinalEnum")
 [out2]
 main:3: error: Cannot override writable attribute "x" with a final one
+main:3: error: Incompatible types in assignment (expression has type "Ok", base class "RegularEnum" defined the type as "int")
 main:4: error: Cannot extend enum with existing members: "FinalEnum"
 main:5: error: Cannot override final attribute "x" (previously declared in base class "FinalEnum")