misc: use PIL.Image.Resampling.LANCZOS instead of PIL.Image.LANCZOS (#71899)

PIL.Image.LANCZOS is deprecated.

src/authentic2/forms/fields.py

@@ -147,7 +147,12 @@ class ProfileImageField(FileField):
                 box[3] += box[1]
 
             image = image.crop(box)
-        return image.resize([width, height], PIL.Image.LANCZOS)
+        try:
+            resampling_algorithm = PIL.Image.Resampling.LANCZOS
+        except AttributeError:
+            # can be removed when Pillow < 9.1.0 is not supported anymore
+            resampling_algorithm = PIL.Image.LANCZOS
+        return image.resize([width, height], resampling_algorithm)
 
 
 class ValidatedEmailField(EmailField):

tox.ini

@@ -179,6 +179,7 @@ filterwarnings =
   error:.*please use dns.resolver.resolve:DeprecationWarning:
   error:.*Passing None for the middleware get_response argument is deprecated.*::
   error:.*ANTIALIAS is deprecated and will be removed in Pillow 10::
+  error:.*LANCZOS.*Pillow 10::
 junit_family=xunit2
 
 [coverage:run]