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

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

Author: pre-commit-ci[bot]

src/PIL/Image.py

@@ -492,7 +492,7 @@ def __init__(self):
         self._exif = None
 
     def _use_im_values(self):
-        ''' Whether or not to try using values from self.im in addition to the values in this class. '''
+        """Whether or not to try using values from self.im in addition to the values in this class."""
         return self.im is not None
 
     @property