Hi!

While rebuilding the python related packages against the Python 3.15rc2
version we found that python-beartype fails to build from source [1].

To fix this, I had to apply two backported upstream patches:
  - commit a1b45d6 [2]: Python 3.15 x 1.
  - commit 4a9fa1d [3]: _colorize blacklist.

I've applied these fixes in the sandbox [4] to verify that it builds
successfully, please consider applying the patch to support the upcoming
3.15 version.

Setting the severity to important for now. Once Python 3.15 is released,
it will be added to python3-defaults and this bug will become release
critical.

Happy hacking,

[1]: https://debusine.debian.net/debian/r-python-python3.15/artifact/4720235/
[2]: https://github.com/beartype/beartype/commit/a1b45d695319a2686469c0ea8f9ae0eef76d5da0
[3]: https://github.com/beartype/beartype/commit/4a9fa1dcb61cd21d2b100d6c53bd8642d13f650d