Drop support for EOL PyPy3.9 by hugovk · Pull Request #8335 · python-pillow/Pillow

PyPy 7.3.17 is out, including PyPy3.10 and dropping PyPy3.9:

The keen-eyed will have noticed no mention of Python version 3.9 in the releases above. Typically we will maintain only one version of Python3, but due to PyPy3.9 support on conda-forge we maintained multiple versions from the first release of PyPy3.10 in PyPy v7.3.12 (Dec 2022). Conda-forge is sunsetting its PyPy support, which means we can drop PyPy3.9.

https://pypy.org/posts/2024/08/pypy-v7317-release.html#pypy-versions-and-speed-pypy-org