The ANTIALIAS constant was removed in Pillow 10.0.0 (after being deprecated through many previous versions). Now you need to use PIL.Image.LANCZOS or PIL.Image.Resampling.LANCZOS.

(This is the exact same algorithm that ANTIALIAS referred to - you just can no longer access it through the name ANTIALIAS.) The Lanczos filter exists since 1979 as is named as such in virtually all other picture applications/libraries (along with other interpolation filters).

Simple code example:

import PIL
import numpy as np

# Gradient image with a sharp color boundary across the diagonal
large_arr = np.fromfunction(lambda x, y, z: (x+y)//(z+1),
                            (256, 256, 3)).astype(np.uint8)
large_img = PIL.Image.fromarray(large_arr)

# Resize it: PIL.Image.LANCZOS also works here
small_img = large_img.resize((128, 128), PIL.Image.Resampling.LANCZOS)
print(small_img.size)

large_img.show()
small_img.show()

well, I re-built the whole docker image, tried invoke update again and this time it ran the database migrations successfully and only stopped with the error from above after that. For my purpose of preparing the DB for restoring from a backup this was good enough - so no need to dig further here I guess...