Update Pillow to support Python 3.13 compatibility

[dahagag]

Problem

The package installation fails on Python 3.13 with the following error during Pillow 9.2.0 build:

KeyError: '__version__'
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1

Root Cause

Pillow 9.2.0 (released July 2022) does not support Python 3.13. The error occurs because Pillow's setup.py tries to read __version__ from a module in a way that is incompatible with Python 3.13.

Solution

Upgrade Pillow from version 9.2.0 to 10.1.0 or newer. Pillow 10.1.0 (released October 2023) includes full Python 3.13 support.

Files to Update:

• requirements.txt: Change Pillow==9.2.0 to Pillow==10.1.0
• requirements-webapp.txt: Change Pillow==9.2.0 to Pillow==10.1.0

Additional Context

This issue affects installation via Ansible on systems running Python 3.13. The error appears during the pip install process when building wheels for the opwen_email_client package.

A pull request with the fix will follow.

[dahagag]

Additional Python 3.13 Compatibility Issue Found

While testing the Pillow fix, another Python 3.13 compatibility issue was discovered with the mkwvconf==0.1.1 dependency:

error in mkwvconf setup command: 'python_requires' must be a string containing valid version specifiers; Invalid specifier: '>=2.7.*'

The mkwvconf package has an invalid version specifier '>=2.7.*' which Python 3.13's stricter validation rejects. This is the latest version available (0.1.1).

This issue will need to be addressed separately, either by:

1. Fixing the mkwvconf package upstream
2. Finding an alternative solution
3. Using a compatibility workaround

The Pillow fix in PR #606 is still valid and should be merged, but full Python 3.13 compatibility will require addressing the mkwvconf issue as well.

[nzola]

Thanks Mohamad for tackling this problem as quick as possible!