willow autopkg tests fail with pillow 11.3, see
https://ci.debian.net/packages/w/willow/testing/amd64/63881740/

[...]
  50s autopkgtest [19:08:51]: test runtests: [-----------------------
  52s
sssssssss.......sss............................................................u..x.........................ssssx...........x..............E.........xx........x.....u.x.........ssss........s.........s..x..x.ss..s.......
  52s ======================================================================
  52s ERROR: test_save_avif_lossless
(tests.test_pillow.TestPillowOperations.test_save_avif_lossless)
  52s ----------------------------------------------------------------------
  52s Traceback (most recent call last):
  52s   File
"/tmp/autopkgtest-lxc.a5_k6kk9/downtmp/autopkgtest_tmp/tests/test_pillow.py",
line 351, in test_save_avif_lossless
  52s     lossless_file = self.image.save_as_avif(io.BytesIO(),
lossless=True)
  52s   File "/usr/lib/python3/dist-packages/willow/plugins/pillow.py",
line 302, in save_as_avif
  52s     self.image.save(f, "AVIF", quality=-1, chroma=444)
  52s     ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  52s   File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2588,
in save
  52s     save_handler(self, fp, filename)
  52s     ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  52s   File "/usr/lib/python3/dist-packages/PIL/AvifImagePlugin.py",
line 161, in _save
  52s     raise ValueError(msg)
  52s ValueError: Invalid quality setting
  52s
  52s ======================================================================
  52s UNEXPECTED SUCCESS: test_avif
(tests.test_image.TestImageFormats.test_avif)
  52s UNEXPECTED SUCCESS: test_save_as_avif
(tests.test_image.TestSaveImage.test_save_as_avif)
  52s ----------------------------------------------------------------------
  52s Ran 219 tests in 1.423s
  52s
  52s FAILED (errors=1, skipped=25, expected failures=9, unexpected
successes=2)

We believe that the bug you reported is fixed in the latest version of
willow, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1112369@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Matthias Klose <doko@debian.org> (supplier of updated willow package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 02 Sep 2025 08:53:32 +0200
Source: willow
Architecture: source
Version: 1.11.0-0.1
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Matthias Klose <doko@debian.org>
Closes: 1112369
Changes:
 willow (1.11.0-0.1) unstable; urgency=medium
 .
   * Non-maintainer upload.
   * New upstream version. Closes: #1112369.
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