Support Python 3.14

[valeriupredoi]

Support for Python 3.14.0 that will be released October 7, 2025.
What's new in 3.14 https://docs.python.org/3.14/whatsnew/3.14.html

Issues

All packages apart from dask support 3.14 and solve the environment

Fixed issues

[valeriupredoi]

@davidhassell would you oppose removing dask as a direct dependency of PyActiveStorage? The only place where it's imported and used is in the dask demo, but that's not a system module (yet)