[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

mypy/nested-class-scope.py

@@ -3,10 +3,12 @@
 x: Optional[int] = None
 y: Optional[int] = None
 
+
 def f() -> None:
     x = 1
     y = 1
+
     class C:
         reveal_type(x)  # Incorrectly reveals int, should be Optional[int]
         reveal_type(y)  # Correctly reveals int
-        x = 2
+        x = 2