Update transitioning_from_defaults.md to recent python3

[drf5n]

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The current documentation at https://conda-forge.org/docs/user/transitioning_from_defaults/ indicates that a default python=3 environment created by conda create --name conda-forge-env python=3 --channel conda-forge --override-channels will install python 3.11. However, the current conda-forge python default is 3.14.

I'm not sure whether it is better to make the doc revision match the default, or to drop the revision out of the text. Before, someone chose the explicit revision in the text, which makes sens, but is now outdated.

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