Fix formatting

dulwich/objects.py

@@ -52,9 +52,10 @@ from .errors import (
 from .file import GitFile
 
 if TYPE_CHECKING:
-    from .file import _GitFile
     from _hashlib import HASH
 
+    from .file import _GitFile
+
 ZERO_SHA = b"0" * 40
 
 # Header fields for commits