[Snyk] Security upgrade pillow from 9.5.0 to 12.3.0

[caniszczyk]

Snyk has created this PR to fix 4 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• builders/testdata/python/appengine_sdk/requirements.txt

⚠️ Warning

appengine-python-standard 2.0.1 requires Pillow, which is not installed.

Breaking Change Risk

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[caniszczyk]

This major version upgrade from Pillow 9.5.0 to 12.3.0 includes several significant breaking changes that require code modifications and environment updates.

Key Breaking Changes:

• Python Version Support: Support for Python 3.7, 3.8, and 3.9 has been dropped across versions 10.0.0, 11.0.0, and 12.0.0. Your environment must be using at least Python 3.10. [2, 3, 9]
• Removed Image Constants: In version 10.0.0, many deprecated constants were removed and replaced by enums. This is a frequent cause of breakage. For example:
  • PIL.Image.ANTIALIAS is removed. Use PIL.Image.Resampling.LANCZOS instead. [15]
  • PIL.Image.CUBIC is removed. Use PIL.Image.Resampling.BICUBIC instead. [14]
• API and Module Removals:
  • v10.0.0: im.category attribute, support for Tk/Tcl 8.4, and several JpegImagePlugin and ImagePalette parameters have been removed. [6, 11]
  • v11.0.0: PyAccess, Image.USE_CFFI_ACCESS, and the internal PSFile class were removed. [3]
  • v12.0.0: Several internal functions like ImageFile.raise_oserror and IptcImageFile helpers were removed. [2]

Recommendation:

This upgrade requires significant developer action. Before merging, you must:

1. Ensure your project is running on Python 3.10 or newer.
2. Review your code for usage of removed constants like ANTIALIAS and CUBIC and update them to use the new Image.Resampling enum values.
3. Thoroughly test all image processing functionality, as other less common API removals may affect your application.

Source: Pillow Changelog [1, 5]

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