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

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

Tests/test_file_ani.py

@@ -1,3 +1,4 @@
+from __future__ import annotations
 from io import BytesIO
 
 import pytest

src/PIL/AniImagePlugin.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import struct
 from io import BytesIO
 

src/PIL/CurImagePlugin.py

@@ -16,6 +16,7 @@
 # See the README file for information on usage and redistribution.
 #
 from __future__ import annotations
+
 from io import BytesIO
 
 from . import BmpImagePlugin, IcoImagePlugin, Image, ImageFile