Relevant: Anki build failed because Python 3.14 is installed on my system (in addition to Python 3.13)
TL;DR
After applying fix(build): respect .python-version when generating pyenv by iamllama · Pull Request #4436 · ankitects/anki · GitHub, Anki’s build scripts will use Python 3.13.5 to build Anki even if you have a newer Python installed on the system instead of just failing.
I guess that the ideal fix is to bump the relevant deps so that Anki can be built using 3.14 too. However, dae is not active here or on GitHub for the last few months. So, the development is slow.