Mise: changing default on idiomatic_version_file_enable_tools

[rsyring]

mise WARN deprecated [idiomatic_version_file_enable_tools]:
Idiomatic version files like ~/projects/coppy-pkg/.python-version are currently enabled by default. However, this will change in mise 2025.10.0 to instead default to disabled.

You can remove this warning by explicitly enabling idiomatic version files for python with:

mise settings add idiomatic_version_file_enable_tools python

You can disable idiomatic version files with:

mise settings add idiomatic_version_file_enable_tools "[]"

See jdx/mise#4345 for more information.